今天項(xiàng)目中遇到獲取驗(yàn)證碼之后有一個倒計時功能的實(shí)現(xiàn)混滔,百度了一下堤尾,有兩種實(shí)現(xiàn)方式的隙券,再次總結(jié)一下宁舰,以便日后需要查看,也方面其他的人查看凭需,不多說了直接貼代碼吧:
第一種:NSTimer
-在倒計時開始之后狸棍,讓button處于一種不可點(diǎn)擊的狀態(tài)副渴,直至倒計時結(jié)束酣胀。
[self.vCodeBtn setEnabled:NO];
count = 60;
NSTimer *time = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(openFire:) userInfo:nil repeats:YES];
-函數(shù)實(shí)現(xiàn)方法:
-(void)openFire:(NSTimer *)time
{
count--;
NSString *miao = [NSString stringWithFormat:@"%ld",(long)count];
[self.vCodeBtn setTitle:miao forState:0];
if (count == 1)
{
[self.vCodeBtn setTitle:@"Reacquire" forState:0];
[self.vCodeBtn setEnabled:YES];
[time invalidate];
}
}
第二種:使用GCD來實(shí)現(xiàn):
__block int timeout=300; //倒計時時間
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); //每秒執(zhí)行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){ //倒計時結(jié)束刁赦,關(guān)閉
dispatch_source_cancel(_timer);
dispatch_release(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置
娶聘。闻镶。。丸升。铆农。。狡耻。墩剖。
});
}else{
int minutes = timeout / 60;
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%d分%.2d秒后重新獲取驗(yàn)證碼",minutes, seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置
。夷狰。岭皂。。沼头。爷绘。书劝。。
});
timeout--;
}
});
dispatch_resume(_timer);