TextView的封装和自定义

实现的效果如下:

1 #import <UIKit/UIKit.h>
2 
3 @interface CustomTextView : UITextView
4 
5 @property (nonatomic , strong) UILabel *placeHolderLabel; // 默认的Label
6 @property (nonatomic , strong) NSString *placeholderStr;  // 默认的文字显示
7 @property (nonatomic , strong) UIColor *palceHolderColor;  //默认文字显示的颜色
8 @end

 1 #import "CustomTextView.h"
 2 
 3 @implementation CustomTextView
 4 
 5 - (instancetype)initWithFrame:(CGRect)frame{
 6     
 7     self = [super initWithFrame:frame];
 8     if (self) {
 9         [self setPlaceholderStr:@""];
10         [self setPalceHolderColor:[UIColor lightGrayColor]];
11         
12     }
13     return self;
14 }
15 
16 // 接收数据
17 
18 - (void)setPlaceholderStr:(NSString *)placeholderStr{
19     
20     if (_placeholderStr != placeholderStr) {
21         
22         _placeholderStr = placeholderStr;
23         
24         // 防止创建多个
25         
26         [self.placeHolderLabel removeFromSuperview];
27         self.placeHolderLabel = nil;
28         
29         // 重新绘制  会调用drawRect方法
30         
31         [self setNeedsDisplay];
32     }
33 }
34 
35 - (void)drawRect:(CGRect)rect{
36     
37     [super drawRect:rect];
38     if (self.placeholderStr.length > 0) {
39         
40         if (_placeHolderLabel == nil) {
41             _placeHolderLabel = [[UILabel alloc]initWithFrame:CGRectMake(8, 8, self.bounds.size.width - 16, 0)];
42             _placeHolderLabel.lineBreakMode = NSLineBreakByWordWrapping;
43             _placeHolderLabel.numberOfLines = 0;
44             _placeHolderLabel.font = self.font;
45             _placeHolderLabel.backgroundColor = [UIColor clearColor];
46             _placeHolderLabel.textColor = self.palceHolderColor;
47             _placeHolderLabel.alpha = 0;
48             _placeHolderLabel.tag = 999;
49             [self addSubview:_placeHolderLabel];
50         }
51         _placeHolderLabel.text = self.placeholderStr;
52         
53         //自适应宽高
54         [_placeHolderLabel sizeToFit];
55         
56     }
57     if ([[self text] length] == 0 && [[self placeholderStr] length] >0) {
58         [[self viewWithTag:999] setAlpha:1.0];
59     }
60 
61 }

使用如下:

  1 #import "Button1Controller.h"
  2 
  3 #import "CustomTextView.h"
  4 
  5 #define kTextBorderColor     RGBCOLOR(227,224,216)
  6 #undef  RGBCOLOR
  7 #define RGBCOLOR(r,g,b) [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1]
  8 
  9 
 10 @interface Button1Controller ()<UITextViewDelegate>
 11 
 12 @property (nonatomic,strong) CustomTextView *textView;
 13 @property (nonatomic , strong) UIButton *commitButton;
 14 
 15 @end
 16 
 17 @implementation Button1Controller
 18 
 19 - (void)viewDidLoad {
 20     [super viewDidLoad];
 21 
 22     self.view.backgroundColor = [UIColor colorWithRed:229.0/255 green:229.0/255 blue:229.0/255 alpha:1.0f];
 23     
 24     [self.view addSubview:self.textView];
 25     
 26     self.automaticallyAdjustsScrollViewInsets = NO;
 27     
 28     [self.view addSubview:self.commitButton];
 29 
 30 
 31 }
 32 
 33 
 34 // TextView
 35 
 36 - (CustomTextView *)textView{
 37     
 38     if (!_textView) {
 39         _textView = [[CustomTextView alloc]initWithFrame:CGRectMake(20, 84, self.view.frame.size.width - 40, 180)];
 40         _textView.backgroundColor = [UIColor whiteColor];
 41         _textView.delegate = self;
 42         _textView.font = [UIFont systemFontOfSize:14.f];
 43         _textView.textColor = [UIColor blackColor];
 44         _textView.textAlignment = NSTextAlignmentLeft;
 45         _textView.editable = YES;
 46         _textView.layer.cornerRadius = 4.0f;
 47         _textView.layer.borderColor = kTextBorderColor.CGColor;
 48         _textView.layer.borderWidth = 0.5;
 49         _textView.palceHolderColor = RGBCOLOR(0x89, 0x89, 0x89);
 50         _textView.placeholderStr = @"请输入您的宝贵意见，我们会尽快处理!";
 51     }
 52     
 53     return _textView;
 54 
 55     
 56 }
 57 
 58 // CommutButton
 59 
 60 - (UIButton *)commitButton{
 61     
 62     if (!_commitButton) {
 63         _commitButton = [UIButton buttonWithType:UIButtonTypeCustom];
 64         _commitButton.layer.cornerRadius = 2.0f;
 65         _commitButton.frame = CGRectMake(40, CGRectGetMaxY(self.textView.frame)+20, self.view.frame.size.width - 80, 40);
 66         _commitButton.backgroundColor = [self colorWithRGBHex:0x60cdf8];
 67         [_commitButton setTitle:@"提交" forState:UIControlStateNormal];
 68         [_commitButton addTarget:self action:@selector(sendFeedBack) forControlEvents:UIControlEventTouchUpInside];
 69     }
 70     
 71     return _commitButton;
 72     
 73 
 74 }
 75 
 76 // 16进制转颜色
 77 
 78 - (UIColor *)colorWithRGBHex:(UInt32)hex
 79 {
 80     int r = (hex >> 16) & 0xFF;
 81     int g = (hex >> 8) & 0xFF;
 82     int b = (hex) & 0xFF;
 83     
 84     return [UIColor colorWithRed:r / 255.0f
 85                            green:g / 255.0f
 86                             blue:b / 255.0f
 87                            alpha:1.0f];
 88 }
 89 
 90 // 提交按钮被点击
 91 
 92 - (void)sendFeedBack{
 93     
 94     NSLog(@"提交...");
 95     
 96 }
 97 
 98 // 判断如果用户输入
,则收回键盘
 99 
100 - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
101     
102     if ([text isEqualToString:@"
"]) {
103         [textView resignFirstResponder];
104         return NO;
105     }
106     return YES;
107 }
108 
109 - (void)textViewDidBeginEditing:(UITextView *)textView{
110     
111     self.textView.placeholderStr = @"";
112 }