iOS开发--验证码
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iOS开发--验证码
小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.
第一步,拖兩個(gè)空間textfiled和button到storyboard上的viewcontroller上。
第二步,拖線,鏈接到.h文件中代碼如下:
| 1 | @property (weak, nonatomic) IBOutlet UIButton *l_timeButton; |
第三步,在,m文件中為l_timeButton設(shè)置監(jiān)聽器,監(jiān)聽點(diǎn)擊事件。
| 1 2 3 4 | - (void)viewDidLoad { ????[super viewDidLoad]; ????[_l_timeButton addTarget:self action:@selector(startTime) forControlEvents:UIControlEventTouchUpInside]; } |
第四步,在方法“startTime”中實(shí)現(xiàn)倒計(jì)時(shí)功能
| 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 | -(void)startTime{ ????__block int timeout=30; //倒計(jì)時(shí)時(shí)間 ????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); //每秒執(zhí)行 ????dispatch_source_set_event_handler(_timer, ^{ ????????if(timeout<=0){ //倒計(jì)時(shí)結(jié)束,關(guān)閉 ????????????dispatch_source_cancel(_timer); ????????????dispatch_async(dispatch_get_main_queue(), ^{ ????????????????//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置 ????????????????[_l_timeButton setTitle:@"發(fā)送驗(yàn)證碼" forState:UIControlStateNormal]; ????????????????_l_timeButton.userInteractionEnabled = YES; ????????????}); ????????}else{ ????????????int seconds = timeout % 60; ????????????NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds]; ????????????dispatch_async(dispatch_get_main_queue(), ^{ ????????????????//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置 ????????????????//NSLog(@"____%@",strTime); ????????????????[UIView beginAnimations:nil context:nil]; ????????????????[UIView setAnimationDuration:1]; ????????????????[_l_timeButton setTitle:[NSString stringWithFormat:@"%@秒后重新發(fā)送",strTime] forState:UIControlStateNormal]; ????????????????[UIView commitAnimations]; ????????????????_l_timeButton.userInteractionEnabled = NO; ????????????}); ????????????timeout--; ????????} ????}); ????dispatch_resume(_timer); } |
一個(gè)驗(yàn)證碼倒計(jì)時(shí)的功能就寫好了
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