ios 簡單的倒計時驗證碼數秒過程實現

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1. timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFireMethod:) userInfo:nil repeats:YES];  

1. //倒計時方法驗證碼實現倒計時60秒，60秒後按鈕變換開始的樣子  
2. -(void)timerFireMethod:(NSTimer *)theTimer {  
3.     if (seconds == 1) {  
4.         [theTimer invalidate];  
5.         seconds = 60;  
6.         [validCodeBtn_ setTitle:@"擷取驗證碼" forState: UIControlStateNormal];  
7.         [validCodeBtn_ setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];  
8.         [validCodeBtn_ setEnabled:YES];  
9.     }else{  
10.         seconds--;  
11.         NSString *title = [NSString stringWithFormat:MSG_DYNAMIC_CODE_WAIT,seconds];  
12.         [validCodeBtn_ setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];  
13.         [validCodeBtn_ setEnabled:NO];  
14.         [validCodeBtn_ setTitle:title forState:UIControlStateNormal];  
15.     }  
16. }  
17. //如果登陸成功，停止驗證碼的倒數，  
18. - (void)releaseTImer {  
19.     if (timer) {  
20.         if ([timer respondsToSelector:@selector(isValid)]) {  
21.             if ([timer isValid]) {  
22.                 [timer invalidate];  
23.                 seconds = 60;  
24.             }  
25.         }  
26.     }  
27. }  

ios 簡單的倒計時驗證碼數秒過程實現