IOS SMS Verification Code Countdown button implementation

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:

Call this method in the button's Click event

-(void) opencountdown{

__block Nsinteger time = 59;

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);

Dispatch_source_set_event_handler (_timer, ^{

if (time <= 0) {

Dispatch_source_cancel (_timer);

Dispatch_async (Dispatch_get_main_queue (), ^{

[Self.authcodebtn settitle:@ "Resend" 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 (), ^{

[Self.authcodebtn settitle:[nsstring stringwithformat:@ Resend (%.2d) ", seconds] forstate:uicontrolstatenormal];

[Self.authcodebtn settitlecolor:[uicolor colorfromhexcode:@ "979797"]

Forstate:uicontrolstatenormal];

self.authCodeBtn.userInteractionEnabled = NO;

});

time--;

}

});

Dispatch_resume (_timer);

}

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