69 lines
1.7 KiB
Objective-C
69 lines
1.7 KiB
Objective-C
//
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// CountDownHelper.m
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// YUMI
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//
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// Created by YUMI on 2021/9/15.
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//
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#import "CountDownHelper.h"
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@interface CountDownHelper ()
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@property (strong, nonatomic) dispatch_source_t timer;
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@end
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@implementation CountDownHelper
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+ (instancetype)shareHelper {
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static dispatch_once_t onceToken;
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static CountDownHelper * helper = nil;
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dispatch_once(&onceToken, ^{
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helper = [[CountDownHelper alloc] init];
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});
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return helper;
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}
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// 停止倒计时
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- (void)stopCountDown {
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if (self.timer != nil) {
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dispatch_source_cancel(self.timer);
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self.timer = nil;
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}
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}
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// 开始倒计时
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- (void)openCountdownWithTime:(int)totalTime{
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if (time <= 0) {
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return;
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}
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__block int time = totalTime; //倒计时时间
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if (self.timer != nil) {
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dispatch_source_cancel(self.timer);
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}
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
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dispatch_source_set_timer(self.timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
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__weak typeof(self) weakself = self;
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dispatch_source_set_event_handler(self.timer, ^{
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__strong typeof(weakself) self = weakself;
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if(time <= 0){ //倒计时结束，关闭
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dispatch_source_cancel(self.timer);
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dispatch_async(dispatch_get_main_queue(), ^{
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if (self.delegate && [self.delegate respondsToSelector:@selector(onCountdownFinish)]) {
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[self.delegate onCountdownFinish];
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}
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});
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}else{
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time--;
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dispatch_async(dispatch_get_main_queue(), ^{
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//设置按钮显示读秒效果
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if (self.delegate && [self.delegate respondsToSelector:@selector(onCountdownOpen:)]) {
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[self.delegate onCountdownOpen:time];
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}
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});
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}
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});
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dispatch_resume(self.timer);
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}
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@end
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