#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface LITimer_GCD : NSObject
+(NSString *)execTask:(void(^)(void))task;
+(NSString *)execTask:(void(^)(void))task
? ? ? ? ? start:(NSTimeInterval)start
?? ? ? interval:(NSTimeInterval)interval
? ? ? ? repeats:(BOOL)repeatsasync:(BOOL)async;
+(void)cancleTask:(NSString *)taskName;
@end
NS_ASSUME_NONNULL_END
================================================.m文件
#import "LITimer_GCD.h"
@implementation LITimer_GCD
static NSMutableDictionary *timers;
dispatch_semaphore_t semaphore_;
+(void)initialize
{
? ? staticdispatch_once_tonceToken;
? ? dispatch_once(&onceToken, ^{
? ? ? ? timers = [[NSMutableDictionary alloc] init];
? ? ? ? semaphore_ = dispatch_semaphore_create(1);
? ? });
}
+(NSString*)execTask:(void(^)(void))task
{
? ? return [self execTask:task start:0 interval:1 repeats:YES async:NO];
}
+(NSString*)execTask:(void(^)(void))taskstart:(NSTimeInterval)startinterval:(NSTimeInterval)intervalrepeats:(BOOL)repeatsasync:(BOOL)async
{
? ? if(!task || start <0|| (interval <=0&& repeats)) {
? ? ? ? returnnil;
? ? }
? ? //創(chuàng)建隊(duì)列
? ? dispatch_queue_t queue = async ? dispatch_queue_create("timer", DISPATCH_QUEUE_SERIAL) : dispatch_get_main_queue();
? ? //創(chuàng)建定時(shí)器
? ? dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
? ? //設(shè)置時(shí)間
? ? dispatch_source_set_timer(timer,dispatch_time(DISPATCH_TIME_NOW, start *NSEC_PER_SEC), interval *NSEC_PER_SEC,0);
? ? //加鎖-防止多線程操作字典
? ? dispatch_semaphore_wait(semaphore_, DISPATCH_TIME_FOREVER);
? ? //設(shè)置名字
? ? NSString *name = [NSString stringWithFormat:@"%lu",(unsigned long)timers.count];
? ? timers[name] = timer;
? ? //解鎖
? ? dispatch_semaphore_signal(semaphore_);
? ? //設(shè)置回調(diào)
? ? dispatch_source_set_event_handler(timer, ^{
? ? ? ? task();
? ? ? ? if(!repeats){
? ? ? ? ? ? [selfcancleTask:name];
? ? ? ? }
? ? });
? ? //啟動(dòng)定時(shí)器
? ? dispatch_resume(timer);
? ? returnname;
}
+(void)cancleTask:(NSString*)taskName
{
? ? if(taskName.length<=0) {
? ? ? ? return;
? ? }
? ? dispatch_source_ttimer =timers[taskName];
? ? if(!timer){
? ? ? ? return;
? ? }
? ? //加鎖
? ? dispatch_semaphore_wait(semaphore_, DISPATCH_TIME_FOREVER);
? ? dispatch_source_cancel(timer);
? ? [timers removeObjectForKey:taskName];
? ? dispatch_semaphore_signal(semaphore_);
}
@end
