獲取驗證碼按鈕以及點選後重復倒計時
阿新 • • 發佈:2018-12-19
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); }