通过 NVUIGradientButton 类来实现，作者： Nicolas Verinaud
1 // 2 // NVUIGradientButton.h 3 // 4 // Created by Nicolas Verinaud on 20/06/12. 5 // Copyright (c) 2012 nverinaud.com. All rights reserved. 6 // 7 8 #import <UIKit/UIKit.h> 9 10 typedef enum { 11 NVUIGradientButtonStyleDefault = 1, 12 NVUIGradientButtonStyleBlackOpaque, 13 NVUIGradientButtonStyleBlackTranslucent 14 } NVUIGradientButtonStyle; 15 16 17 @interface NVUIGradientButton : UIControl 18 19 @property (nonatomic, assign) NVUIGradientButtonStyle style; 20 //角度半径 21 @property (nonatomic) CGFloat cornerRadius; // Default to 10.0 22 //边宽 23 @property (nonatomic) CGFloat borderWidth; // Default to 2.0 24 //填充颜色 25 @property (strong, nonatomic) UIColor *tintColor; // Default to gray 26 //高亮时填充颜色 27 @property (strong, nonatomic) UIColor *highlightedTintColor; // Default to nice blue 28 //边框颜色 29 @property (strong, nonatomic) UIColor *borderColor; // Default to darkGray 30 //高亮时边框颜色 31 @property (strong, nonatomic) UIColor *highlightedBorderColor; // Default to white 32 //字体颜色 33 @property (strong, nonatomic) UIColor *textColor; // Default to black 34 //高亮时字体颜色 35 @property (strong, nonatomic) UIColor *highlightedTextColor; // Default to white 36 //字体阴影颜色 37 @property (strong, nonatomic) UIColor *textShadowColor; // Default to clear 38 //高亮时字体阴影颜色 39 @property (strong, nonatomic) UIColor *highlightedTextShadowColor; // Default to darkGrey 40 //内容文字 41 @property (copy, nonatomic) NSString *text; 42 //高亮时内容文字 43 @property (copy, nonatomic) NSString *highlightedText; // Default to text 44 //设置disabled状态颜色 45 @property (copy, nonatomic) NSString *disabledText; // Default to text 46 //字所在的label 47 @property (strong, nonatomic, readonly) UILabel *titleLabel; 48 //设置YES渐变色,设置NO单色 49 @property (nonatomic, getter = isGradientEnabled) BOOL gradientEnabled; // Default to YES, set to NO to draw flat color 50 //rightAccessory图片 51 @property (nonatomic, strong) UIImage *rightAccessoryImage; 52 //高亮时rightAccessory图片 53 @property (nonatomic, strong) UIImage *rightHighlightedAccessoryImage; 54 55 //三种初始化便利方式 56 // Designated initializer 57 - (id)initWithFrame:(CGRect)frame style:(NVUIGradientButtonStyle)style cornerRadius:(CGFloat)cornerRadius borderWidth:(CGFloat)borderWidth andText:(NSString *)text; 58 // Convenient initializers 59 - (id)initWithFrame:(CGRect)frame cornerRadius:(CGFloat)cornerRadius borderWidth:(CGFloat)borderWidth andText:(NSString *)text; 60 - (id)initWithFrame:(CGRect)frame style:(NVUIGradientButtonStyle)style; 61 62 // Convenience for configuration depending on states 63 //填充颜色 64 - (void)setTintColor:(UIColor *)tintColor forState:(UIControlState)state; 65 //边颜色 66 - (void)setBorderColor:(UIColor *)borderColor forState:(UIControlState)state; 67 //字颜色 68 - (void)setTextColor:(UIColor *)textColor forState:(UIControlState)state; 69 //字阴影颜色 70 - (void)setTextShadowColor:(UIColor *)textShadowColor forState:(UIControlState)state; 71 //文字 72 - (void)setText:(NSString *)text forState:(UIControlState)state; 73 //RightAccessory 74 - (void)setRightAccessoryImage:(UIImage *)rightAccessoryImage forState:(UIControlState)state; 75 76 @end
1 // 2 // NVUIGradientButton.m 3 // 4 // Created by Nicolas Verinaud on 20/06/12. 5 // Copyright (c) 2012 nverinaud.com. All rights reserved. 6 // 7 8 #import "NVUIGradientButton.h" 9 10 @interface NVUIGradientButton () 11 - (void)performDefaultInit; 12 - (void)updateAccordingToStyle; 13 - (BOOL)isHighlightedOrSelected; 14 - (UIColor *)tintColorAccordingToCurrentState; 15 - (UIColor *)borderColorAccordingToCurrentState; 16 - (UIColor *)textColorAccordingToCurrentState; 17 - (UIColor *)textShadowColorAccordingToCurrentState; 18 - (NSString *)textAccordingToCurrentState; 19 - (UIImage *)rightAccessoryImageAccordingToCurrentState; 20 - (CGGradientRef)newGradientAccordingToCurrentState; 21 @property (strong, nonatomic, readwrite) UILabel *titleLabel; 22 @end 23 24 25 @implementation NVUIGradientButton 26 27 #pragma mark - Creation 28 29 #define NVUIGradientButtonDefaultCorderRadius 10.0 30 #define NVUIGradientButtonDefaultBorderWidth 2.0 31 32 - (void)performDefaultInit 33 { 34 // Defaults 35 _highlightedText = _text; 36 _disabledText = _text; 37 38 // Label 39 _titleLabel = [[UILabel alloc] init]; 40 _titleLabel.textAlignment = UITextAlignmentCenter; 41 _titleLabel.lineBreakMode = UILineBreakModeMiddleTruncation; 42 _titleLabel.numberOfLines = 0; 43 _titleLabel.font = [UIFont boldSystemFontOfSize:15.0]; 44 _titleLabel.minimumFontSize = 12.0; 45 _titleLabel.shadowOffset = CGSizeMake(0, -1); 46 47 _gradientEnabled = YES; 48 49 self.opaque = NO; 50 self.backgroundColor = [UIColor clearColor]; 51 } 52 53 54 - (void)updateAccordingToStyle 55 { 56 switch (_style) 57 { 58 case NVUIGradientButtonStyleBlackOpaque: 59 { 60 self.tintColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1]; 61 self.highlightedTintColor = [UIColor colorWithRed:(CGFloat)3/255 green:(CGFloat)112/255 blue:(CGFloat)236/255 alpha:1]; 62 self.borderColor = [UIColor whiteColor]; 63 self.highlightedBorderColor = [UIColor whiteColor]; 64 self.textColor = [UIColor whiteColor]; 65 self.highlightedTextColor = [UIColor whiteColor]; 66 self.textShadowColor = [UIColor clearColor]; 67 self.highlightedTextShadowColor = [UIColor clearColor]; 68 break; 69 } 70 71 case NVUIGradientButtonStyleBlackTranslucent: 72 { 73 self.tintColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7]; 74 self.highlightedTintColor = [UIColor colorWithRed:(CGFloat)3/255 green:(CGFloat)112/255 blue:(CGFloat)236/255 alpha:0.7]; 75 self.borderColor = [UIColor whiteColor]; 76 self.highlightedBorderColor = [UIColor whiteColor]; 77 self.textColor = [UIColor whiteColor]; 78 self.highlightedTextColor = [UIColor whiteColor]; 79 self.textShadowColor = [UIColor clearColor]; 80 self.highlightedTextShadowColor = [UIColor clearColor]; 81 break; 82 } 83 84 case NVUIGradientButtonStyleDefault: 85 { 86 CGFloat gray = 220.0/255.0; 87 self.tintColor = [UIColor colorWithRed:gray green:gray blue:gray alpha:1]; 88 self.highlightedTintColor = [UIColor colorWithRed:0 green:(CGFloat)157/255 blue:1 alpha:1]; 89 self.borderColor = [UIColor darkGrayColor]; 90 self.highlightedBorderColor = [UIColor whiteColor]; 91 self.textColor = [UIColor blackColor]; 92 self.highlightedTextColor = [UIColor whiteColor]; 93 self.textShadowColor = [UIColor clearColor]; 94 self.highlightedTextShadowColor = [UIColor darkGrayColor]; 95 break; 96 } 97 } 98 } 99 100 #pragma mark Designated initializer 101 102 - (id)initWithFrame:(CGRect)frame style:(NVUIGradientButtonStyle)style cornerRadius:(CGFloat)cornerRadius borderWidth:(CGFloat)borderWidth andText:(NSString *)text 103 { 104 self = [super initWithFrame:frame]; 105 if (self) 106 { 107 _cornerRadius = cornerRadius; 108 _borderWidth = borderWidth; 109 _text = text; 110 111 [self performDefaultInit]; 112 113 self.style = style; 114 } 115 return self; 116 } 117 118 119 #pragma mark Convenient initializers 120 121 - (id)initWithFrame:(CGRect)frame cornerRadius:(CGFloat)cornerRadius borderWidth:(CGFloat)borderWidth andText:(NSString *)text 122 { 123 return [self initWithFrame:frame style:NVUIGradientButtonStyleDefault cornerRadius:cornerRadius borderWidth:borderWidth andText:text]; 124 } 125 126 127 - (id)initWithFrame:(CGRect)frame style:(NVUIGradientButtonStyle)style 128 { 129 return [self initWithFrame:frame style:style cornerRadius:NVUIGradientButtonDefaultCorderRadius borderWidth:NVUIGradientButtonDefaultBorderWidth andText:nil]; 130 } 131 132 #pragma mark Overriden initializers 133 134 - (id)initWithFrame:(CGRect)frame 135 { 136 return [self initWithFrame:frame style:NVUIGradientButtonStyleDefault cornerRadius:NVUIGradientButtonDefaultCorderRadius borderWidth:NVUIGradientButtonDefaultBorderWidth andText:nil]; 137 } 138 139 140 - (id)initWithCoder:(NSCoder *)aDecoder 141 { 142 self = [super initWithCoder:aDecoder]; 143 if (self) 144 { 145 _cornerRadius = NVUIGradientButtonDefaultCorderRadius; 146 _borderWidth = NVUIGradientButtonDefaultBorderWidth; 147 148 [self performDefaultInit]; 149 150 self.style = NVUIGradientButtonStyleDefault; 151 } 152 return self; 153 } 154 155 156 #pragma mark - Setters 157 158 - (void)setStyle:(NVUIGradientButtonStyle)style 159 { 160 if (style != _style) 161 { 162 _style = style; 163 [self updateAccordingToStyle]; 164 } 165 } 166 167 168 - (void)setTintColor:(UIColor *)tintColor 169 { 170 if (tintColor != _tintColor) 171 { 172 _tintColor = tintColor; 173 174 if (self.state == UIControlStateNormal) 175 [self setNeedsDisplay]; 176 } 177 } 178 179 180 - (void)setHighlightedTintColor:(UIColor *)highlightedTintColor 181 { 182 if (highlightedTintColor != _highlightedTintColor) 183 { 184 _highlightedTintColor = highlightedTintColor; 185 186 if ([self isHighlightedOrSelected]) 187 [self setNeedsDisplay]; 188 } 189 } 190 191 192 - (void)setBorderColor:(UIColor *)borderColor 193 { 194 if (borderColor != _borderColor) 195 { 196 _borderColor = borderColor; 197 198 if (self.state == UIControlStateNormal) 199 [self setNeedsDisplay]; 200 } 201 } 202 203 204 - (void)setHighlightedBorderColor:(UIColor *)highlightedBorderColor 205 { 206 if (highlightedBorderColor != _highlightedBorderColor) 207 { 208 _highlightedBorderColor = highlightedBorderColor; 209 210 if ([self isHighlightedOrSelected]) 211 [self setNeedsDisplay]; 212 } 213 } 214 215 216 - (void)setTextColor:(UIColor *)textColor 217 { 218 if (textColor != _textColor) 219 { 220 _textColor = textColor; 221 222 if (self.state == UIControlStateNormal) 223 [self setNeedsDisplay]; 224 } 225 } 226 227 228 - (void)setHighlightedTextColor:(UIColor *)highlightedTextColor 229 { 230 if (highlightedTextColor != _highlightedTextColor) 231 { 232 _highlightedTextColor = highlightedTextColor; 233 234 if ([self isHighlightedOrSelected]) 235 [self setNeedsDisplay]; 236 } 237 } 238 239 240 - (void)setTextShadowColor:(UIColor *)textShadowColor 241 { 242 if (textShadowColor != _textShadowColor) 243 { 244 _textShadowColor = textShadowColor; 245 246 if (self.state == UIControlStateNormal) 247 [self setNeedsDisplay]; 248 } 249 } 250 251 252 - (void)setHighlightedTextShadowColor:(UIColor *)highlightedTextShadowColor 253 { 254 if (highlightedTextShadowColor != _highlightedTextShadowColor) 255 { 256 _highlightedTextShadowColor = highlightedTextShadowColor; 257 258 if ([self isHighlightedOrSelected]) 259 [self setNeedsDisplay]; 260 } 261 } 262 263 264 - (void)setText:(NSString *)text 265 { 266 if (![text isEqualToString:_text]) 267 { 268 _text = text; 269 270 if (self.state == UIControlStateNormal) 271 [self setNeedsDisplay]; 272 } 273 } 274 275 276 - (void)setHighlightedText:(NSString *)highlightedText 277 { 278 if (![highlightedText isEqualToString:_highlightedText]) 279 { 280 _highlightedText = highlightedText; 281 282 if ([self isHighlightedOrSelected]) 283 [self setNeedsDisplay]; 284 } 285 } 286 287 288 - (void)setDisabledText:(NSString *)disabledText 289 { 290 if (![disabledText isEqualToString:_disabledText]) 291 { 292 _disabledText = disabledText; 293 294 if (self.state & UIControlStateDisabled) 295 [self setNeedsDisplay]; 296 } 297 } 298 299 300 - (void)setRightAccessoryImage:(UIImage *)rightAccessoryImage 301 { 302 if (rightAccessoryImage != _rightAccessoryImage) 303 { 304 _rightAccessoryImage = rightAccessoryImage; 305 306 if (self.state == UIControlStateNormal) 307 [self setNeedsDisplay]; 308 } 309 } 310 311 312 - (void)setRightHighlightedAccessoryImage:(UIImage *)rightHighlightedAccessoryImage 313 { 314 if (rightHighlightedAccessoryImage != _rightHighlightedAccessoryImage) 315 { 316 _rightHighlightedAccessoryImage = rightHighlightedAccessoryImage; 317 318 if ([self isHighlightedOrSelected]) 319 [self setNeedsDisplay]; 320 } 321 } 322 323 324 #pragma mark - Convenience configuration for states 325 326 - (BOOL)isHighlightedOrSelected 327 { 328 return (self.state & UIControlStateHighlighted || self.state & UIControlStateSelected); 329 } 330 331 332 - (void)setTintColor:(UIColor *)tintColor forState:(UIControlState)state 333 { 334 if (state == UIControlStateNormal) 335 self.tintColor = tintColor; 336 337 if (state & UIControlStateHighlighted || state & UIControlStateSelected) 338 self.highlightedTintColor = tintColor; 339 } 340 341 342 - (void)setBorderColor:(UIColor *)borderColor forState:(UIControlState)state 343 { 344 if (state == UIControlStateNormal) 345 self.borderColor = borderColor; 346 347 if (state & UIControlStateHighlighted || state & UIControlStateSelected) 348 self.highlightedBorderColor = borderColor; 349 } 350 351 352 - (void)setTextColor:(UIColor *)textColor forState:(UIControlState)state 353 { 354 if (state == UIControlStateNormal) 355 self.textColor = textColor; 356 357 if (state & UIControlStateHighlighted || state & UIControlStateSelected) 358 self.highlightedTextColor = textColor; 359 } 360 361 362 - (void)setTextShadowColor:(UIColor *)textShadowColor forState:(UIControlState)state 363 { 364 if (state == UIControlStateNormal) 365 self.textShadowColor = textShadowColor; 366 367 if (state & UIControlStateHighlighted || state & UIControlStateSelected) 368 self.highlightedTextShadowColor = textShadowColor; 369 } 370 371 372 - (void)setText:(NSString *)text forState:(UIControlState)state 373 { 374 if (state == UIControlStateNormal) 375 self.text = text; 376 377 if (state & UIControlStateDisabled) 378 self.disabledText = text; 379 380 if (state & UIControlStateHighlighted || state & UIControlStateSelected) 381 self.highlightedText = text; 382 } 383 384 385 - (void)setRightAccessoryImage:(UIImage *)rightAccessoryImage forState:(UIControlState)state 386 { 387 if (state == UIControlStateNormal) 388 self.rightAccessoryImage = rightAccessoryImage; 389 390 if (state & UIControlStateHighlighted || state & UIControlStateSelected) 391 self.rightHighlightedAccessoryImage = rightAccessoryImage; 392 } 393 394 395 - (UIColor *)tintColorAccordingToCurrentState 396 { 397 UIColor *tintColor = _tintColor; 398 399 if([self isHighlightedOrSelected]) 400 tintColor = _highlightedTintColor; 401 402 return tintColor; 403 } 404 405 406 - (UIColor *)borderColorAccordingToCurrentState 407 { 408 UIColor *borderColor = _borderColor; 409 410 if ([self isHighlightedOrSelected] && _highlightedBorderColor) 411 borderColor = _highlightedBorderColor; 412 413 return borderColor; 414 } 415 416 417 - (UIColor *)textColorAccordingToCurrentState 418 { 419 UIColor *textColor = _textColor; 420 421 if ([self isHighlightedOrSelected] && _highlightedTextColor) 422 textColor = _highlightedTextColor; 423 424 if (!self.enabled) 425 textColor = [textColor colorWithAlphaComponent:0.5]; 426 427 return textColor; 428 } 429 430 431 - (UIColor *)textShadowColorAccordingToCurrentState 432 { 433 UIColor *textShadowColor = _textShadowColor; 434 435 if ([self isHighlightedOrSelected] && _highlightedTextShadowColor) 436 textShadowColor = _highlightedTextShadowColor; 437 438 return textShadowColor; 439 } 440 441 442 - (NSString *)textAccordingToCurrentState 443 { 444 NSString *text = _text; 445 446 if (!self.enabled && _disabledText) 447 text = _disabledText; 448 else if ([self isHighlightedOrSelected] && _highlightedText) 449 text = _highlightedText; 450 451 return text; 452 } 453 454 455 - (UIImage *)rightAccessoryImageAccordingToCurrentState 456 { 457 UIImage *image = _rightAccessoryImage; 458 459 if ([self isHighlightedOrSelected] && _rightHighlightedAccessoryImage) 460 image = _rightHighlightedAccessoryImage; 461 462 return image; 463 } 464 465 466 #pragma mark - Gradient 467 468 - (CGGradientRef)newGradientAccordingToCurrentState 469 { 470 CGGradientRef gradient = NULL; 471 472 // Compute the colors of the gradient 473 UIColor *middleColor = [self tintColorAccordingToCurrentState]; 474 475 CGFloat red = 0, green = 0, blue = 0, alpha = 0; 476 if ([middleColor respondsToSelector:@selector(getRed:green:blue:alpha:)]) // iOS 5+ 477 { 478 [middleColor getRed:&red green:&green blue:&blue alpha:&alpha]; 479 } 480 else if (middleColor) 481 { 482 CGColorRef color = [middleColor CGColor]; 483 const CGFloat *components = CGColorGetComponents(color); 484 red = components[0]; 485 green = components[1]; 486 blue = components[2]; 487 alpha = components[3]; 488 } 489 490 CGFloat offsetColor = 50.0f/255.0f; 491 UIColor *topColor = [UIColor colorWithRed:fminf(1, red+offsetColor) green:fminf(1, green+offsetColor) blue:fminf(1, blue+offsetColor) alpha:alpha]; 492 UIColor *bottomColor = [UIColor colorWithRed:fminf(1, red-offsetColor) green:fminf(1, green-offsetColor) blue:fminf(1, blue-offsetColor) alpha:alpha]; 493 494 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 495 496 // Create an array of colors 497 CFMutableArrayRef colors = CFArrayCreateMutable(NULL, 3, NULL); 498 CFArrayAppendValue(colors, [topColor CGColor]); 499 CFArrayAppendValue(colors, [middleColor CGColor]); 500 CFArrayAppendValue(colors, [bottomColor CGColor]); 501 502 // Create the gradient 503 gradient = CGGradientCreateWithColors(colorSpace, colors, NULL); 504 505 // Memory free 506 CFRelease(colors); 507 CGColorSpaceRelease(colorSpace); 508 509 return gradient; 510 } 511 512 513 #pragma mark - Drawing 514 515 #define DEFAULT_PADDING 4 516 517 - (void)drawRect:(CGRect)rect 518 { 519 // Setting Env 520 CGContextRef ctx = UIGraphicsGetCurrentContext(); 521 UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:_cornerRadius]; 522 CGFloat padding = _borderWidth + DEFAULT_PADDING; 523 UIColor *borderColor = [self borderColorAccordingToCurrentState]; 524 UIColor *textColor = [self textColorAccordingToCurrentState]; 525 UIColor *textShadowColor = [self textShadowColorAccordingToCurrentState]; 526 NSString *text = [self textAccordingToCurrentState]; 527 528 // Draw 529 [path addClip]; 530 531 // Draw background 532 if (_gradientEnabled) 533 { 534 CGGradientRef gradient = [self newGradientAccordingToCurrentState]; 535 CGFloat midX = CGRectGetMidX(self.bounds); 536 CGFloat botY = CGRectGetMaxY(self.bounds); 537 CGPoint startPoint = CGPointMake(midX, 0); 538 CGPoint endPoint = CGPointMake(midX, botY); 539 CGContextDrawLinearGradient(ctx, gradient, startPoint, endPoint, 0); 540 CGGradientRelease(gradient); 541 } 542 else 543 { 544 UIColor *tint = [self tintColorAccordingToCurrentState]; 545 [tint set]; 546 [path fill]; 547 } 548 549 // Draw right image 550 UIImage *rightImage = [self rightAccessoryImageAccordingToCurrentState]; 551 CGRect rightAccessoryRect = CGRectZero; 552 if (rightImage) 553 { 554 CGFloat maxHeight = CGRectGetHeight(self.bounds) - padding*2; 555 rightAccessoryRect.size.height = MIN(maxHeight, rightImage.size.height); 556 rightAccessoryRect.size.width = rightAccessoryRect.size.height / rightImage.size.height * rightImage.size.width; 557 rightAccessoryRect.origin.y = (CGRectGetHeight(self.bounds) - CGRectGetHeight(rightAccessoryRect)) / 2; 558 rightAccessoryRect.origin.x = CGRectGetWidth(self.bounds) - CGRectGetWidth(rightAccessoryRect) - padding; 559 [rightImage drawInRect:rightAccessoryRect]; 560 } 561 562 // Draw border 563 if (_borderWidth > 0) 564 { 565 path.lineWidth = _borderWidth; 566 [borderColor set]; 567 [path stroke]; 568 } 569 570 // Draw text 571 CGRect innerRect = self.bounds; 572 innerRect = CGRectInset(innerRect, padding, padding); 573 if (rightImage) 574 innerRect.size.width = CGRectGetMinX(rightAccessoryRect); 575 576 _titleLabel.textColor = textColor; 577 _titleLabel.shadowColor = textShadowColor; 578 _titleLabel.text = text; 579 580 [textColor set]; 581 [_titleLabel drawTextInRect:innerRect]; 582 } 583 584 585 #pragma mark - Touch Handling 586 587 - (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event 588 { 589 self.highlighted = YES; 590 [self setNeedsDisplay]; 591 return [super beginTrackingWithTouch:touch withEvent:event]; 592 } 593 594 595 - (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event 596 { 597 self.highlighted = [self isTouchInside]; 598 [self setNeedsDisplay]; 599 return [super continueTrackingWithTouch:touch withEvent:event]; 600 } 601 602 603 - (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event 604 { 605 [super endTrackingWithTouch:touch withEvent:event]; 606 self.highlighted = NO; 607 [self setNeedsDisplay]; 608 } 609 610 611 - (void)cancelTrackingWithEvent:(UIEvent *)event 612 { 613 [super cancelTrackingWithEvent:event]; 614 self.highlighted = NO; 615 [self setNeedsDisplay]; 616 } 617 618 619 #pragma mark - Accessibility 620 621 - (BOOL)isAccessibilityElement 622 { 623 return YES; 624 } 625 626 627 - (NSString *)accessibilityLabel 628 { 629 return [self textAccordingToCurrentState]; 630 } 631 632 633 - (UIAccessibilityTraits)accessibilityTraits 634 { 635 UIAccessibilityTraits traits = UIAccessibilityTraitButton; 636 637 if ([self isHighlightedOrSelected]) 638 traits = traits >> UIAccessibilityTraitSelected; 639 640 if (!self.enabled) 641 traits = traits >> UIAccessibilityTraitNotEnabled; 642 643 return traits; 644 } 645 646 647 - (NSString *)accessibilityHint 648 { 649 return [self textAccordingToCurrentState]; 650 } 651 652 653 @end
使用范例：
NVUIGradientButton* btnRight = [[NVUIGradientButton alloc] initWithFrame:CGRectMake(self.view.frame.size.width-80, 5, 70, 30) style:NVUIGradientButtonStyleDefault]; btnRight.text = @"返回首页"; btnRight.textColor = [UIColor whiteColor]; btnRight.highlightedTextColor = [UIColor whiteColor]; btnRight.textShadowColor = [UIColor darkGrayColor]; btnRight.tintColor = [UIColor colorWithRed:(CGFloat)98.0f/255.0f green:(CGFloat)122.0f/255.0f blue:(CGFloat)156.0/255.0f alpha:1]; btnRight.highlightedTintColor = [UIColor colorWithRed:(CGFloat)81.0f/255.0f green:(CGFloat)102.0f/255.0f blue:(CGFloat)131.0f/255.0f alpha:1]; btnRight.borderColor = [UIColor colorWithRed:(CGFloat)47.0f/255.0f green:(CGFloat)57.0f/255.0f blue:(CGFloat)67.0f/255.0f alpha:1]; btnRight.highlightedBorderColor = [UIColor colorWithRed:(CGFloat)46.0f/255.0f green:(CGFloat)62.0f/255.0f blue:(CGFloat)87.0f/255.0f alpha:1]; btnRight.titleLabel.font = [UIFont systemFontOfSize:12.0f]; [btnRight addTarget:self action:@selector(onBtnRight:) forControlEvents:UIControlEventTouchUpInside];