方法一：
网上用的很多的一种,不多说，直接上代码.
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
-(void)startTime{ dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue); dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行 dispatch_source_set_event_handler(_timer, ^{ if(timeout<=0){ //倒计时结束，关闭 dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{ self.getIdentifyCodeBt.userInteractionEnabled = YES; [self.getIdentifyCodeBt setTitleColor:THEME_RED forState:UIControlStateNormal]; self.getIdentifyCodeBt.backgroundColor = [UIColor whiteColor]; self.getIdentifyCodeBt.layer.borderColor = THEME_RED.CGColor; }); }else{ dispatch_async(dispatch_get_main_queue(), ^{ [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:1]; [self.getIdentifyCodeBt setTitle:[NSString stringWithFormat:@"%zd秒后失效",timeout] forState:UIControlStateNormal]; [self.getIdentifyCodeBt setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; self.getIdentifyCodeBt.backgroundColor = [UIColor lightGrayColor]; self.getIdentifyCodeBt.layer.borderColor = [UIColor clearColor].CGColor; self.getIdentifyCodeBt.clipsToBounds = YES; [UIView commitAnimations]; self.getIdentifyCodeBt.userInteractionEnabled = NO; }); timeout--; } }); dispatch_resume(_timer);} |
到时直接调用就可以了。
方法二：利用分类
给UIButton新建一个分类
.h文件如下
|
1
2
3
4
5
6
|
#import <UIKit/UIKit.h>@interface UIButton (XSCountDown)- (void)xs_beginCountDownWithDuration:(NSTimeInterval)duration;- (void)xs_stopCountDown;@end |
.m文件如下
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#import "UIButton+XSCountDown.h"#import "ThemeColor.h"static NSTimer *_countTimer;static NSTimeInterval _count;static NSString *_title;@implementation UIButton (XSCountDown)- (void)xs_beginCountDownWithDuration:(NSTimeInterval)duration { _title = self.titleLabel.text; _count = duration; _countTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(xs_updateTitle) userInfo:nil repeats:YES]; [[NSRunLoop mainRunLoop] addTimer:_countTimer forMode:NSRunLoopCommonModes]; self.userInteractionEnabled = NO; [self setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; self.backgroundColor = [UIColor lightGrayColor]; self.layer.borderColor = [UIColor clearColor].CGColor; self.clipsToBounds = YES;}- (void)xs_stopCountDown { [_countTimer invalidate]; _countTimer = nil; _count = 60.0; [self setTitle:_title forState:UIControlStateNormal]; self.userInteractionEnabled = YES;}- (void)xs_updateTitle { NSString *countString = [NSString stringWithFormat:@"%lis 后失效", (long)_count - 1]; self.userInteractionEnabled = NO; [self setTitle:countString forState:UIControlStateNormal]; if (_count-- <= 1.0) { [self xs_stopCountDown]; [self setTitleColor:THEME_RED forState:UIControlStateNormal]; self.backgroundColor = [UIColor whiteColor]; self.layer.borderColor = THEME_RED.CGColor; }}@end |
然后在controller里直接调用分类.h文件里的方法就ok了
|
1
|
[self.verifyBt xs_beginCountDownWithDuration:60.0]; |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.jianshu.com/p/08ed3cf8ec0c?utm_source=tuicool&utm_medium=referral
