標籤:auth auto handler 顯示 pen oba origin cti countdown
引言:
驗證碼倒計時按鈕的應用是非常普遍的,本文介紹了IOS實現驗證碼倒計時功能,點擊擷取驗證碼,進入時間倒計時,感興趣的小夥伴們可以參考一下
實現思路:
- 建立按鈕, 添加點擊方法;
- 用NSTimer定時器, 每秒執行一次, 定時改變Button的title,改變Button的樣式, 設定Button不可點擊;
- 若倒計時結束, 定時器關閉, 並改變Button的樣式, 可以點擊;
代碼如下:
// 開啟倒計時效果-(void)openCountdown{ __block NSInteger time = 59; //倒計時時間 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); //每秒執行 dispatch_source_set_event_handler(_timer, ^{ if(time <= 0){ //倒計時結束,關閉 dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{ //設定按鈕的樣式 [self.authCodeBtn setTitle:@"重新發送" forState:UIControlStateNormal]; [self.authCodeBtn setTitleColor:[UIColor colorFromHexCode:@"FB8557"] forState:UIControlStateNormal]; self.authCodeBtn.userInteractionEnabled = YES; }); }else{ int seconds = time % 60; dispatch_async(dispatch_get_main_queue(), ^{ //設定按鈕顯示讀秒效果 [self.authCodeBtn setTitle:[NSString stringWithFormat:@"重新發送(%.2d)", seconds] forState:UIControlStateNormal]; [self.authCodeBtn setTitleColor:[UIColor colorFromHexCode:@"979797"] forState:UIControlStateNormal]; self.authCodeBtn.userInteractionEnabled = NO; }); time--; } }); dispatch_resume(_timer);}
在按鈕的點擊事件裡調用該方法.
注意點:
我們在建立Button時, 要設定Button的樣式:
當type為: UIButtonTypeCustom時 , 是讀秒的效果.
當type為: 其他時, 是一閃一閃的效果.
iOS 簡訊驗證碼倒計時按鈕的實現