倒计时按钮

来源：互联网发布：扶贫软件编辑：程序博客网时间：2024/05/22 03:08

实现倒计时

添加属性记录倒计时的初值

@property (nonatomic,assign)NSInteger number;

创建一个按钮

UIButton *button = [UIButton buttonWithType:(UIButtonTypeCustom)];

添加Tag值方便取出

button.tag = 1000;

给按钮添加属性

button.frame = CGRectMake(100, 100, 100, 100);
button.backgroundColor = [UIColor redColor];
[button setTitle:@”发送验证码” forState:(UIControlStateNormal)];

给按钮设置点击方法

[button addTarget:self action:@selector(buttonAction:) forControlEvents:(UIControlEventTouchUpInside)];

添加到视图上
[self.view addSubview:button];

给倒计时时间的初值
self.number = 5;

实现点击方法

-(void)buttonAction:(UIButton *)button
{
/*
倒计时核心每隔一秒钟时间递减
计时器(每隔多少时间调用一个方法)
scheduledTimerWithTimeInterval:(NSTimeInterval) 代表时间间隔
target:self selector:@selector(timer:)代表每隔多少时间触发的方法
userInfo:@”button倒计时” 代表标题
repeats:YES 代表是否重复
*/

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timer:) userInfo:@”button倒计时” repeats:YES];

计时器开始
[timer fire];
把交互先关上
button.userInteractionEnabled = NO;

}

实现每个时间间隔中重复触发的方法

-(void)timer:(NSTimer *)timer
{

通过tag值取出按钮视图
UIButton button = (UIButton )[self.view viewWithTag:1000];

改Button的标题
NSString *title = [NSString stringWithFormat:@”%ld”,self.number–];

[button setTitle:title forState:(UIControlStateNormal)];

判断倒计时是否结束标题是否为零
if ([[button titleForState:(UIControlStateNormal)]isEqualToString:@”0”]) {

停止计时器
[timer invalidate];

改Button的标题
[button setTitle:@”重新发送验证” forState:(UIControlStateNormal)];

把交互打开
button.userInteractionEnabled = YES;

重置时间
self.number = 5;

}

0 0