iOS之UI设置随记

1、设置button的正面投影效果:

self.layer.shadowOffset = CGSizeMake(1, 1);

self.layer.shadowOpacity = 0.6;

self.layer.shadowColor = [UIColor blackColor].CGColor;

2、设置label某个文字的颜色大小:

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:label.text];
    //设置字号
    [str addAttribute:NSFontAttributeName value:font range:range];
    //设置文字颜色
    [str addAttribute:NSForegroundColorAttributeName value:vaColor range:range];
    label.attributedText = str;

3、自定义UINavigationController的leftBarButtonItem按钮右滑返回

a、

/////在push前充值器设置代理

- (void)viewDidAppear:(BOOL)animated {

self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;//代理

self.navigationController.interactivePopGestureRecognizer.enabled = NO;//不能右滑

}

//////推出后设置Pop能滑动

- (void)viewDidLoad{

self.navigationController.interactivePopGestureRecognizer.enabled = YES;

}

b、

UIImage *backimg = [UIImage imageNamed:@"返回icon"];

backimg = [backimg imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

self.navigationBar.backIndicatorImage = backimg;

self.navigationBar.backIndicatorTransitionMaskImage = backimg;

UIBarButtonItem *buttonItem = [UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UINavigationBar class]]];

UIOffset offset;

offset.horizontal = -500;

[buttonItem setBackButtonTitlePositionAdjustment:offset forBarMetrics:UIBarMetricsDefault];

- (void)addBorderToLayer:(UIView *)view { CAShapeLayer *border = [CAShapeLayer layer];

// 线条颜色

border.strokeColor = [UIColor blackColor].CGColor;

border.fillColor = nil; border.path = [UIBezierPath bezierPathWithRect:view.bounds].CGPath; border.frame = view.bounds;

// 不要设太大不然看不出效果 border.lineWidth = 1; border.lineCap = @"square"; // 第一个是线条长度第二个是间距 nil时为实线 border.lineDashPattern = @[@9, @4]; [view.layer addSublayer:border]; }

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"baidumap://"]])// -- 使用 canOpenURL 判断需要在info.plist 的 LSApplicationQueriesSchemes 添加 baidumap 。

5、UITableView一个知识点,就是在不会显示满屏的情况下,不会出现多余的cell的分界线(separator).主要有四种方法:

a.设置tableview的tablefooterview为一个空的view;

b.设置separator的样式style为None并且自定义cell的边线;

c.tableview的style设置为Grouped;(跟a/b的区别是最后一条分割线是封闭的)

6、iOS添加边缘手势实现侧滑

UIScreenEdgePanGestureRecognizer *interactiveTransitionRecognizer;

interactiveTransitionRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(interactiveTransitionRecognizerAction:)];

interactiveTransitionRecognizer.edges = UIRectEdgeRight;

[self.view addGestureRecognizer:interactiveTransitionRecognizer];

7、+(BOOL) resolveInstanceMethod:(SEL) sel

这是NSObject根类提供的类方法，调用时机为当被调用的方法实现部分没有找到，而消息转发机制启动之前的这个中间时刻。

提高技能如同提升自信心。