IOS SMS Verification Code Countdown button implementation

Introduction:

Verification Code Countdown button application is very common, this article introduced the IOS Implementation Verification Code countdown function, click to get Verification code, enter the time countdown, interested in the small partners can refer to

Implementation ideas:

• Create button, add click Method;
• With Nstimer timer, execute once per second, change the title of the button, change the button's style, set the button is not clickable;
• If the countdown ends, the timer closes and changes the button's style, you can click;

The code is as follows:

Turn on Countdown effect-(void) opencountdown{__block nsinteger time = 59;//Countdown dispatch_queue_t queue = Dispatch_get_global_qu    Eue (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); Execute Dispatch_source_set_event_handler per second (_timer, ^{if (time <= 0) {//Countdown end, close Dispatch_source_canc            El (_timer); Dispatch_async (Dispatch_get_main_queue (), ^{//Set button style [Self.authcodebtn settitle:@ "Resend" fo                Rstate:uicontrolstatenormal];                [Self.authcodebtn settitlecolor:[uicolor colorfromhexcode:@ "FB8557"] forstate:uicontrolstatenormal];            self.authCodeBtn.userInteractionEnabled = YES;        });            }else{int seconds = time% 60; Dispatch_async (Dispatch_get_main_queue (), ^{//Set button displays read seconds effect [self.authcodebtnSettitle:[nsstring stringwithformat:@ "Resend (%.2d)", seconds] forstate:uicontrolstatenormal];                [Self.authcodebtn settitlecolor:[uicolor colorfromhexcode:@ "979797"] forstate:uicontrolstatenormal];            self.authCodeBtn.userInteractionEnabled = NO;            });        time--;    }    }); Dispatch_resume (_timer);}

This method is called in the button's Click event.

Note the point:

When we create the button, we set the button's style:
When type is: Uibuttontypecustom, it is the effect of reading seconds.
When the type is: Other, it is a flashing effect.

IOS SMS Verification Code Countdown button implementation