IOS Countdown method

There are two ways to countdown: 1. Nstimer 2.GCD

Design ideas: The view has a label and Button,label with Nstimer Countdown, button with GCD, click button simultaneously countdown, 5 seconds after the stop

On the code:

In @interface:

@property (assign,nonatomic) int numer;

@property (strong,nonatomic) nstimer * timer;

@property (strong,nonatomic) UILabel * label;

@property (strong,nonatomic) UIButton * BTN;

In Viewdidload:

Self.view.backgroundcolor=[uicolor Whitecolor];

self.numer=5;

UILabel * Label=[[uilabel alloc]initwithframe:cgrectmake (100, 100, 100, 100)];

Label.backgroundcolor=[uicolor Orangecolor];

Label.textalignment=nstextalignmentcenter;

Label.textcolor=[uicolor Whitecolor];

[Self.view Addsubview:label];

Self.label=label;

UIButton * Btn=[uibutton Buttonwithtype:uibuttontypecustom];

Btn.frame=cgrectmake (Cgrectgetmaxy (label.frame) +20, 100, 100);

Btn.backgroundcolor=[uicolor Redcolor];

[Btn addtarget:self Action: @selector (BBB) forcontrolevents:uicontroleventtouchupinside];

[btn Settitlecolor:[uicolor Whitecolor] forstate:uicontrolstatenormal];

[Btn settitle:@ "click" Forstate:uicontrolstatenormal];

[Self.view ADDSUBVIEW:BTN];

SELF.BTN=BTN;

Button method and Nstimer method:

-(void) BBB

{

Self.timer=[nstimer scheduledtimerwithtimeinterval:1 target:self selector: @selector (AAA) Userinfo:nil Repeats:yes];

[[Nsrunloop Currentrunloop]addtimer:self.timer formode:nsrunloopcommonmodes];

__block int timeout=5; Countdown time

dispatch_queue_t queue = Dispatch_get_global_queue (Dispatch_queue_priority_default, 0);

dispatch_source_t timers = dispatch_source_create (Dispatch_source_type_timer, 0, 0,queue);

Dispatch_source_set_timer (Timers,dispatch_walltime (NULL, 0), 1.0*nsec_per_sec, 0); Executes per second

Dispatch_source_set_event_handler (Timers, ^{

if (timeout<=0) {//Countdown end, close

Dispatch_source_cancel (timers);

Dispatch_async (Dispatch_get_main_queue (), ^{

Set the interface button to display the settings according to your needs

[Self.btn settitle:@ "click" Forstate:uicontrolstatenormal];

BTN can click

Self.btn.userinteractionenabled=yes;

self.numer=5;

[Self.btn addtarget:self Action: @selector (BBB) forcontrolevents:uicontroleventtouchupinside];

});

}else{

int minutes = TIMEOUT/60;

int seconds = timeout% 60;

NSString *strtime = [NSString stringwithformat:@ "%d minutes%.2d seconds", minutes, seconds];

Dispatch_async (Dispatch_get_main_queue (), ^{

Set the interface button to display the settings according to your needs

[Self.btn settitle:strtime Forstate:uicontrolstatenormal];

BTN No Click

Self.btn.userinteractionenabled=no;

});

timeout--;

}

});

Dispatch_resume (timers);

}

-(void) AAA

{

self.numer--;

Self.label.text=[nsstring stringwithformat:@ "%d", Self.numer];

if (self.numer==0) {

[Self.timer invalidate];

[Email protected] "no";

}

}

IOS Countdown method