简单的对倒计时进行封装
.h文件
+ (void)beginCodeWithBtn:(UIButton *)btn timeVlaueSum:(int)timeValue beginState:(void (^)())begin endState:(void (^)(int seconds))end;
.m文件
static dispatch_source_t _timer;
@implementation FYTimerCodeTool
//开始倒计时
+ (void)beginCodeWithBtn:(UIButton *)btn timeVlaueSum:(int)timeValue beginState:(void (^)())begin endState:(void (^)(int seconds))end{
__block NSInteger time = timeValue; //倒计时时间
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
_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); //每秒执行
dispatch_source_set_event_handler(_timer, ^{
if(time <= 0){ //倒计时结束，关闭
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//设置按钮的样式
begin();
});
}else{
int seconds = time % 60;
dispatch_async(dispatch_get_main_queue(), ^{
//设置按钮显示读秒效果
end(seconds);
});
time--;
}
});
dispatch_resume(_timer);
}
+ (void)cancelTimer{
dispatch_source_cancel(_timer);
}
