226，GCD实例演示
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#import "ViewController.h"
@interface ViewController ()
@property (nonatomic,strong)dispatch_queue_t concurrentQueue;
@property (nonatomic,strong)dispatch_queue_t serialQueue;
@property (nonatomic,strong)dispatch_queue_t mainQueue;
@end
@implementation ViewController
- (dispatch_queue_t)concurrentQueue{
if (_concurrentQueue ==nil) {
_concurrentQueue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
}
return_concurrentQueue;
}
- (dispatch_queue_t)serialQueue{
if (_serialQueue ==nil) {
_serialQueue =dispatch_queue_create("cn.ljs",NULL);;
}
return_serialQueue;
}
- (dispatch_queue_t)mainQueue{
if (_mainQueue ==nil) {
_mainQueue =dispatch_get_main_queue();
}
return_mainQueue;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//[self asynchronousConcurrent];
//[self asynchronouseSerial];
//[self asynchronouseMain];
//[self synchronousConcurrent];
[selfsynchronouseSerial];
}
//异步，并发队列:开了多条子线程，同时执行多个任务
- (void)asynchronousConcurrent{
dispatch_async(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片1--------",[NSThreadcurrentThread]);
});
dispatch_async(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片2--------",[NSThreadcurrentThread]);
});
dispatch_async(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片3--------",[NSThreadcurrentThread]);
});
dispatch_async(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片4--------",[NSThreadcurrentThread]);
});
dispatch_async(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片5--------",[NSThreadcurrentThread]);
});
}
//2016-01-21 13:03:57.206 5，GCD实例[1056:110598] -----<NSThread: 0x7fabd0e032a0>{number = 5, name = (null)}-------下载图片4--------
//2016-01-21 13:03:57.206 5，GCD实例[1056:110599] -----<NSThread: 0x7fabd0d1f290>{number = 6, name = (null)}-------下载图片5--------
//2016-01-21 13:03:57.206 5，GCD实例[1056:110385] -----<NSThread: 0x7fabd2904550>{number = 4, name = (null)}-------下载图片3--------
//2016-01-21 13:03:57.206 5，GCD实例[1056:110384] -----<NSThread: 0x7fabd2b0e2c0>{number = 3, name = (null)}-------下载图片2--------
//2016-01-21 13:03:57.206 5，GCD实例[1056:110383] -----<NSThread: 0x7fabd0e03890>{number = 2, name = (null)}-------下载图片1--------
//异步，串行队列:会创建一条子线程，按照队列顺序，任务一个接着一个地执行
- (void)asynchronouseSerial{
dispatch_async(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片1--------",[NSThreadcurrentThread]);
});
dispatch_async(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片2--------",[NSThreadcurrentThread]);
});
dispatch_async(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片3--------",[NSThreadcurrentThread]);
});
dispatch_async(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片4--------",[NSThreadcurrentThread]);
});
dispatch_async(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片5--------",[NSThreadcurrentThread]);
});
}
//2016-01-21 13:20:54.017 5，GCD实例[1295:122912] -----<NSThread: 0x7fdc9051ca20>{number = 2, name = (null)}-------下载图片1--------
//2016-01-21 13:20:54.018 5，GCD实例[1295:122912] -----<NSThread: 0x7fdc9051ca20>{number = 2, name = (null)}-------下载图片2--------
//2016-01-21 13:20:54.018 5，GCD实例[1295:122912] -----<NSThread: 0x7fdc9051ca20>{number = 2, name = (null)}-------下载图片3--------
//2016-01-21 13:20:54.018 5，GCD实例[1295:122912] -----<NSThread: 0x7fdc9051ca20>{number = 2, name = (null)}-------下载图片4--------
//2016-01-21 13:20:54.018 5，GCD实例[1295:122912] -----<NSThread: 0x7fdc9051ca20>{number = 2, name = (null)}-------下载图片5--------
//异步，主队列(主队列就是一个串行队列):不会创建子线程，只在主线程中按照串行队列顺序一个接着一个地执行
- (void)asynchronouseMain{
dispatch_async(self.mainQueue, ^{
NSLog(@"-----%@-------下载图片1--------",[NSThreadcurrentThread]);
});
dispatch_async(self.mainQueue, ^{
NSLog(@"-----%@-------下载图片2--------",[NSThreadcurrentThread]);
});
dispatch_async(self.mainQueue, ^{
NSLog(@"-----%@-------下载图片3--------",[NSThreadcurrentThread]);
});
dispatch_async(self.mainQueue, ^{
NSLog(@"-----%@-------下载图片4--------",[NSThreadcurrentThread]);
});
dispatch_async(self.mainQueue, ^{
NSLog(@"-----%@-------下载图片5--------",[NSThreadcurrentThread]);
});
}
//2016-01-21 13:29:49.524 5，GCD实例[1383:127064] -----<NSThread: 0x7fc2e0f034a0>{number = 1, name = main}-------下载图片1--------
//2016-01-21 13:29:49.525 5，GCD实例[1383:127064] -----<NSThread: 0x7fc2e0f034a0>{number = 1, name = main}-------下载图片2--------
//2016-01-21 13:29:49.525 5，GCD实例[1383:127064] -----<NSThread: 0x7fc2e0f034a0>{number = 1, name = main}-------下载图片3--------
//2016-01-21 13:29:49.526 5，GCD实例[1383:127064] -----<NSThread: 0x7fc2e0f034a0>{number = 1, name = main}-------下载图片4--------
//2016-01-21 13:29:49.526 5，GCD实例[1383:127064] -----<NSThread: 0x7fc2e0f034a0>{number = 1, name = main}-------下载图片5--------
//同步，并发队列:不会创建子线程，只在主线程中按照串行队列顺序一个接着一个地执行
- (void)synchronousConcurrent{
dispatch_sync(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片1--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片2--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片3--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片4--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.concurrentQueue, ^{
NSLog(@"-----%@-------下载图片5--------",[NSThreadcurrentThread]);
});
}
//2016-01-21 13:36:41.269 5，GCD实例[1439:130167] -----<NSThread: 0x7fe2d4104ce0>{number = 1, name = main}-------下载图片1--------
//2016-01-21 13:36:41.270 5，GCD实例[1439:130167] -----<NSThread: 0x7fe2d4104ce0>{number = 1, name = main}-------下载图片2--------
//2016-01-21 13:36:41.270 5，GCD实例[1439:130167] -----<NSThread: 0x7fe2d4104ce0>{number = 1, name = main}-------下载图片3--------
//2016-01-21 13:36:41.270 5，GCD实例[1439:130167] -----<NSThread: 0x7fe2d4104ce0>{number = 1, name = main}-------下载图片4--------
//2016-01-21 13:36:41.270 5，GCD实例[1439:130167] -----<NSThread: 0x7fe2d4104ce0>{number = 1, name = main}-------下载图片5--------
//同步，串行队列:会创建一条子线程，按照队列顺序，任务一个接着一个地执行
- (void)synchronouseSerial{
dispatch_sync(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片1--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片2--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片3--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片4--------",[NSThreadcurrentThread]);
});
dispatch_sync(self.serialQueue, ^{
NSLog(@"-----%@-------下载图片5--------",[NSThreadcurrentThread]);
});
}
//2016-01-21 13:39:16.764 5，GCD实例[1502:133241] -----<NSThread: 0x7fa2a42037f0>{number = 1, name = main}-------下载图片1--------
//2016-01-21 13:39:16.764 5，GCD实例[1502:133241] -----<NSThread: 0x7fa2a42037f0>{number = 1, name = main}-------下载图片2--------
//2016-01-21 13:39:16.765 5，GCD实例[1502:133241] -----<NSThread: 0x7fa2a42037f0>{number = 1, name = main}-------下载图片3--------
//2016-01-21 13:39:16.765 5，GCD实例[1502:133241] -----<NSThread: 0x7fa2a42037f0>{number = 1, name = main}-------下载图片4--------
//2016-01-21 13:39:16.765 5，GCD实例[1502:133241] -----<NSThread: 0x7fa2a42037f0>{number = 1, name = main}-------下载图片5--------
//同步，主队列:会死锁，不能用
//总结：前三种方法是常用，需要掌握
@end
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