UIButton 继承与UIControl （UIControl继承与UIView）
1.基本语法
1 #import "ViewController.h" 2 #define WIDTH self.view.bounds.size.width 3 @interface ViewController () 4 { 5 NSInteger m_counter; 6 } 7 @end 8 9 @implementation ViewController 10 11 - (void)viewDidLoad 12 { 13 [super viewDidLoad]; 14 15 m_counter = 0; 16 17 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 18 19 //这里需要说明一下 button.buttonType 是 readonly 不允许赋值!!!! 20 21 22 23 24 button.frame = CGRectMake(20, 40, WIDTH - 40, 40); 25 26 27 //设置button是否可以被点击 - default is YES. 28 button.enabled = YES; 29 30 //设置button是否可以和用户之间交互 - default is YES. 31 button.userInteractionEnabled = YES; 32 33 34 //正常状态 -- 设置button的title 35 [button setTitle:@"你确定要点击,别后悔!!!" forState:UIControlStateNormal]; 36 //高亮状态 37 [button setTitle:@"你确定要点击,别后悔!!!" forState:UIControlStateHighlighted]; 38 //不可点击状态 39 [button setTitle:@"你确定要点击,别后悔!!!" forState:UIControlStateDisabled]; 40 41 42 43 44 button.backgroundColor = [UIColor redColor]; 45 46 //UIControlStateNormal --- UIControlStateHighlighted ---- UIControlStateDisabled 47 //不同状态下都可设置 48 [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 49 50 51 //UIControlStateNormal --- UIControlStateHighlighted ---- UIControlStateDisabled 52 //不同状态下都可设置-----注：设置了背景图,那么背景颜色将不会生效!!! 53 [button setBackgroundImage:[UIImage imageNamed:@"background"] forState:UIControlStateNormal]; 54 55 56 /* 57 58 上面设设置背景图，现在是直接把button做成一张图来显示!!! 如果为button设置标题就不会显示 59 //UIControlStateNormal --- UIControlStateHighlighted ---- UIControlStateDisabled 60 //不同状态下都可设置 61 [button setImage:[UIImage imageNamed:@"background"] forState:UIControlStateNormal]; 62 63 */ 64 65 66 67 //设置button在点击的时候时候会高亮一下儿 ---- default is NO 68 [button setShowsTouchWhenHighlighted:YES]; 69 70 71 //设置按钮内部图片间距和标题间距 72 UIEdgeInsets insets; // 设置按钮内部图片间距 73 insets.top = insets.bottom = insets.right = insets.left = 10; 74 button.contentEdgeInsets = insets; 75 button.titleEdgeInsets = insets; // 标题间距 76 77 78 //添加button点击事件 79 [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside]; 80 /* 81 //移除button事件----基本上不用！！！！ 82 [button removeTarget:self action:nil forControlEvents:UIControlEventTouchUpInside]; 83 */ 84 [self.view addSubview:button]; 85 86 87 88 //下面说一下button不常用的属性 89 90 //怎么实现让button中的文字左对齐 或者右对齐 91 button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft; 92 //设置button的标题离边界的距离 93 button.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0); 94 95 96 97 /* 98 99 另外在说一点其他的工作上遇到的问题， 当启动一个定时器让button的标题不断改变的时候.（比如说在获取短信验证码的时候，系统会在点击一次后出现60s的倒计时每隔1s 改变一次button的标题） 100 */ 101 102 103 UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom]; 104 button1.frame = CGRectMake(30, 100, WIDTH - 60, 40); 105 button1.tag = 1000; 106 button1.backgroundColor = [UIColor redColor]; 107 [button1 setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 108 [button1 setTitle:@"点击开始倒计时" forState:UIControlStateNormal]; 109 [button1 addTarget:self action:@selector(button1Click:) forControlEvents:UIControlEventTouchUpInside]; 110 [self.view addSubview:button1]; 111 } 112 -(void)button1Click:(UIButton *)sender 113 { 114 [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(timerFired:) userInfo:nil repeats:YES]; 115 } 116 117 -(void)timerFired:(NSTimer *)sender 118 { 119 UIButton *button = [self.view viewWithTag:1000]; 120 if (++m_counter > 60) 121 { 122 [sender invalidate]; 123 [button setTitle:@"倒计时结束,点击重新开始" forState:UIControlStateNormal]; 124 m_counter = 0; 125 button.enabled = YES; 126 return; 127 } 128 button.enabled = NO; 129 [button setTitle:[NSString stringWithFormat:@"%ld",60 - m_counter] forState:UIControlStateNormal]; 130 } 131 132 133 -(void)buttonClick : (UIButton * )sender 134 { 135 NSLog(@"叫你不要点还要点,算你有种!!!!!"); 136 }