1. 程式人生 > >獲取驗證碼按鈕以及點選後重復倒計時

獲取驗證碼按鈕以及點選後重復倒計時

UIButton樣式

UIButton放在UITextField右邊,這邊就不放TF程式碼了,直接放UIButton樣式程式碼,都是簡單的寫法。

            UIButton *verifyBtn = [UIButton buttonWithType:UIButtonTypeCustom];
            [verifyBtn setTitle:LocalString(@"獲取驗證碼") forState:UIControlStateNormal];
            [verifyBtn.titleLabel setFont:[UIFont systemFontOfSize:13.f]];
            [verifyBtn setTitleColor:[UIColor bluecolor] forState:UIControlStateNormal];
            [verifyBtn addTarget:self action:@selector(getVerifyCode) forControlEvents:UIControlEventTouchUpInside];
            verifyBtn.layer.borderWidth = 0.5;
            verifyBtn.layer.borderColor = [UIColor colorWithHexString:@"4778CC"].CGColor;
            verifyBtn.layer.cornerRadius = 14.f;
            [self.view addSubview:verifyBtn];

再次獲取驗證碼倒計時

倒計時需要用到計時功能,這裡用的是GCD的計時器dispatch_source_set_timer,計時相對比較精確。

直接放程式碼

//開始倒計時
-(void)openCountdown{
    
    __block NSInteger time = 59; //倒計時時間
    
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    _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.verifyBtn setTitle:@"重新發送" forState:UIControlStateNormal];
                [_verifyBtn sizeToFit];
                //[self.verifyBtn setTitleColor:[UIColor darkTextColor] forState:UIControlStateNormal];
                //[_verifyBtn setButtonStyleWithColor:[UIColor blackColor] Width:1.f cornerRadius:5.f];
                self.verifyBtn.userInteractionEnabled = YES;
            });
            
        }else{
            
            int seconds = time % 60;
            dispatch_async(dispatch_get_main_queue(), ^{
                
                //設定按鈕顯示讀秒效果
                [self.verifyBtn setTitle:[NSString stringWithFormat:@"%2ds", seconds] forState:UIControlStateNormal];
                [_verifyBtn sizeToFit];
                //[self.verifyBtn setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
                //[_verifyBtn setButtonStyleWithColor:[UIColor lightGrayColor] Width:1.f cornerRadius:5.f];
                self.verifyBtn.userInteractionEnabled = NO;
            });
            time--;
        }
    });
    dispatch_resume(_timer);
}