#import "ViewController.h" #import "XMGOperation.h" @interface ViewController () @end @implementation ViewController #pragma mark ---------------------- #pragma mark Events -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { [self customWithQueue]; } #pragma mark ---------------------- #pragma mark Methods -(void)invocationOperationWithQueue { //1.创建操作,封装任务 /* 第一个参数:目标对象 self 第二个参数:调用方法的名称 第三个参数:前面方法需要接受的参数 nil */ NSInvocationOperation *op1 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(download1) object:nil]; NSInvocationOperation *op2 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(download2) object:nil]; NSInvocationOperation *op3 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(download3) object:nil]; //2.创建队列 /* GCD: 串行类型:create & 主队列 并发类型:create & 全局并发队列 NSOperation:1：本身不能进行封装任务，必须依靠其子类，NSInvocationOperation，NSBlockOperation或是自定义类，重写main方法来封装任务。这三个子类若没有指定队列，则默认任务是在当前队列中执行的 主队列: [NSOperationQueue mainQueue] 和GCD中的主队列一样,串行队列 非主队列: [[NSOperationQueue alloc]init] 非常特殊(同时具备并发和串行的功能) //默认情况下,非主队列是并发队列：可通过设置最大并发数：为0：没有队列执行操作，1：主队列 大于1，并发队列 */ NSOperationQueue *queue = [[NSOperationQueue alloc]init]; //3.添加操作到队列中 [queue addOperation:op1]; //内部已经调用了[op1 start] [queue addOperation:op2]; [queue addOperation:op3]; } -(void)blockOperationWithQueue { //1.创建操作 NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"1----%@",[NSThread currentThread]); }]; NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"2----%@",[NSThread currentThread]); }]; NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"3----%@",[NSThread currentThread]); }]; //追加任务：当某个操作的任务数量大于1时，默认会开启子线程并发执行，有可能是子线程有可能是主线程不确定 [op2 addExecutionBlock:^{ NSLog(@"4----%@",[NSThread currentThread]); }]; [op2 addExecutionBlock:^{ NSLog(@"5----%@",[NSThread currentThread]); }]; [op2 addExecutionBlock:^{ NSLog(@"6----%@",[NSThread currentThread]); }]; //2.创建队列 NSOperationQueue *queue = [[NSOperationQueue alloc]init]; //3.添加操作到队列 [queue addOperation:op1]; [queue addOperation:op2]; [queue addOperation:op3]; //简便方法：addOperationWithBlock：直接封装任务添加到队列中 //1)创建操作,2)添加操作到队列中 [queue addOperationWithBlock:^{ NSLog(@"7----%@",[NSThread currentThread]); }]; } -(void)customWithQueue { //1.封装操作 XMGOperation *op1 = [[XMGOperation alloc]init]; XMGOperation *op2 = [[XMGOperation alloc]init]; //2.创建队列 NSOperationQueue *queue = [[NSOperationQueue alloc]init]; //3.添加操作到队列 [queue addOperation:op1]; [queue addOperation:op2]; } -(void)download1 { NSLog(@"%s----%@",__func__,[NSThread currentThread]); } -(void)download2 { NSLog(@"%s----%@",__func__,[NSThread currentThread]); } -(void)download3 { NSLog(@"%s----%@",__func__,[NSThread currentThread]); } @end
#import "XMGOperation.h" @implementation XMGOperation //告知要执行的任务是什么 //1.有利于代码隐蔽 //2.复用性 -(void)main { NSLog(@"main---%@",[NSThread currentThread]); } @end
#import "ViewController.h" #import "XMGOperation.h" @interface ViewController () /** 队列 */ @property (nonatomic, strong) NSOperationQueue *queue; @end @implementation ViewController #pragma mark ---------------------- #pragma mark Events /** * 1:先创建队列，设置最大并发数，来决定是串行还是并发，三种方式封装任务，将任务添加到队列（也可以快速实现封装任务到队列）2：任务的取消暂停 * */ -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { [self test2]; } - (IBAction)startBtnClick:(id)sender { //1.创建队列 //默认是并发队列 self.queue = [[NSOperationQueue alloc]init]; //2.设置最大并发数量 maxConcurrentOperationCount self.queue.maxConcurrentOperationCount = 1; XMGOperation *op1 = [[XMGOperation alloc]init]; //4.添加到队列 [self.queue addOperation:op1]; } - (IBAction)suspendBtnClick:(id)sender { //暂停,是可以恢复 /* 队列中的任务也是有状态的:已经执行完毕的 | 正在执行 | 排队等待状态 */ //不能暂停当前正在处于执行状态的任务 [self.queue setSuspended:YES]; } - (IBAction)goOnBtnClick:(id)sender { //继续执行 [self.queue setSuspended:NO]; } - (IBAction)cancelBtnClick:(id)sender { //取消,不可以恢复 //该方法内部调用了所有操作的cancel方法 [self.queue cancelAllOperations]; } -(void)test { //1.创建队列 //默认是并发队列 NSOperationQueue *queue = [[NSOperationQueue alloc]init]; //2.设置最大并发数量 maxConcurrentOperationCount //同一时间最多有多少个任务可以执行 //串行执行任务!=只开一条线程 (线程同步) // maxConcurrentOperationCount >1 那么就是并发队列 // maxConcurrentOperationCount == 1 那就是串行队列 // maxConcurrentOperationCount == 0 不会执行任务 // maxConcurrentOperationCount == -1 特殊意义 最大值 表示不受限制 queue.maxConcurrentOperationCount = 1; //3.封装操作 NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"1----%@",[NSThread currentThread]); }]; NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"2----%@",[NSThread currentThread]); }]; NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"3----%@",[NSThread currentThread]); }]; NSBlockOperation *op4 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"4----%@",[NSThread currentThread]); }]; NSBlockOperation *op5 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"5----%@",[NSThread currentThread]); }]; NSBlockOperation *op6 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"6----%@",[NSThread currentThread]); }]; NSBlockOperation *op7 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"7----%@",[NSThread currentThread]); }]; //4.添加到队列 [queue addOperation:op1]; [queue addOperation:op2]; [queue addOperation:op3]; [queue addOperation:op4]; [queue addOperation:op5]; [queue addOperation:op6]; [queue addOperation:op7]; } -(void)test2 { //1.创建队列 //默认是并发队列 self.queue = [[NSOperationQueue alloc]init]; //2.设置最大并发数量 maxConcurrentOperationCount //同一时间最多有多少个任务可以执行 //串行执行任务!=只开一条线程 (线程同步) // maxConcurrentOperationCount >1 那么就是并发队列 // maxConcurrentOperationCount == 1 那就是串行队列 // maxConcurrentOperationCount == 0 不会执行任务 // maxConcurrentOperationCount == -1 特殊意义 最大值 表示不受限制 self.queue.maxConcurrentOperationCount = 1; //3.封装操作 NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{ for (NSInteger i = 0; i<1000; i++) { NSLog(@"1-%zd---%@",i,[NSThread currentThread]); } }]; NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{ for (NSInteger i = 0; i<1000; i++) { NSLog(@"2-%zd---%@",i,[NSThread currentThread]); } }]; NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{ for (NSInteger i = 0; i<1000; i++) { NSLog(@"3-%zd---%@",i,[NSThread currentThread]); } }]; NSBlockOperation *op4 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"4----%@",[NSThread currentThread]); }]; NSBlockOperation *op5 = [NSBlockOperation blockOperationWithBlock:^{ for (NSInteger i = 0; i<1000; i++) { NSLog(@"5-%zd---%@",i,[NSThread currentThread]); } }]; NSBlockOperation *op6 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"6----%@",[NSThread currentThread]); }]; NSBlockOperation *op7 = [NSBlockOperation blockOperationWithBlock:^{ NSLog(@"7----%@",[NSThread currentThread]); }]; //4.添加到队列 [self.queue addOperation:op1]; [self.queue addOperation:op2]; [self.queue addOperation:op3]; [self.queue addOperation:op4]; [self.queue addOperation:op5]; [self.queue addOperation:op6]; [self.queue addOperation:op7]; } -(void)demo { } @end
- 2.2 NSOperationQueue基本使用
（1）NSOperation中的两种队列
01 主队列 通过mainQueue获得，凡是放到主队列中的任务都将在主线程执行
02 非主队列 直接alloc init出来的队列。非主队列同时具备了并发和串行的功能，通过设置最大并发数属性来控制任务是并发执行还是串行执行
（2）相关代码
```objc
//自定义NSOperation
-(void)customOperation
{
//1.创建队列
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
//2.封装操作
//好处：1.信息隐蔽
//2.代码复用
XMGOperation *op1 = [[XMGOperation alloc]init];
XMGOperation *op2 = [[XMGOperation alloc]init];
//3.添加操作到队列中
[queue addOperation:op1];
[queue addOperation:op2];
}
//NSBlockOperation
- (void)block
{
//1.创建队列
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
//2.封装操作
NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"1----%@",[NSThread currentThread]);
}];
NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"2----%@",[NSThread currentThread]);
}];
[op2 addExecutionBlock:^{
NSLog(@"3----%@",[NSThread currentThread]);
}];
[op2 addExecutionBlock:^{
NSLog(@"4----%@",[NSThread currentThread]);
}];
//3.添加操作到队列中
[queue addOperation:op1];
[queue addOperation:op2];
//补充：简便方法
[queue addOperationWithBlock:^{
NSLog(@"5----%@",[NSThread currentThread]);
}];
}
//NSInvocationOperation
- (void)invocation
{
/*
GCD中的队列：
串行队列：自己创建的，主队列
并发队列：自己创建的，全局并发队列
NSOperationQueue
主队列：[NSOperationQueue mainqueue];凡事放在主队列中的操作都在主线程中执行
非主队列：[[NSOperationQueue alloc]init]，并发和串行，默认是并发执行的
*/
//1.创建队列
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
//2.封装操作
NSInvocationOperation *op1 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(download1) object:nil];
NSInvocationOperation *op2 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(download2) object:nil];
NSInvocationOperation *op3 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(download3) object:nil];
//3.把封装好的操作添加到队列中
[queue addOperation:op1];//[op1 start]
[queue addOperation:op2];
[queue addOperation:op3];
}
```
- 2.3 NSOperation其它用法
（1）设置最大并发数【控制任务并发和串行】
```objc
//1.创建队列
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
//2.设置最大并发数
//注意点：该属性需要在任务添加到队列中之前进行设置
//该属性控制队列是串行执行还是并发执行
//如果最大并发数等于1，那么该队列是串行的，如果大于1那么是并行的
//系统的最大并发数有个默认的值，为-1，如果该属性设置为0，那么不会执行任何任务
queue.maxConcurrentOperationCount = 2;
```
（2）暂停和恢复以及取消
```objc
//设置暂停和恢复
//suspended设置为YES表示暂停，suspended设置为NO表示恢复
//暂停表示不继续执行队列中的下一个任务，暂停操作是可以恢复的
if (self.queue.isSuspended) {
self.queue.suspended = NO;
}else
{
self.queue.suspended = YES;
}
//取消队列里面的所有操作
//取消之后，当前正在执行的操作的下一个操作将不再执行，而且永远都不在执行，就像后面的所有任务都从队列里面移除了一样
//取消操作是不可以恢复的
[self.queue cancelAllOperations];
---------自定义NSOperation取消操作--------------------------
-(void)main
{
//耗时操作1
for (int i = 0; i<1000; i++) {
NSLog(@"任务1-%d--%@",i,[NSThread currentThread]);
}
NSLog(@"+++++++++++++++++++++++++++++++++");
//苹果官方建议，每当执行完一次耗时操作之后，就查看一下当前队列是否为取消状态，如果是，那么就直接退出
//好处是可以提高程序的性能
if (self.isCancelled) {
return;
}
//耗时操作2
for (int i = 0; i<1000; i++) {
NSLog(@"任务1-%d--%@",i,[NSThread currentThread]);
}
NSLog(@"+++++++++++++++++++++++++++++++++");
}
```