iOS NSThread和NSOperation的基本使用详解

NSThread适合简单的耗时任务的执行，它有两种执行方法

- (void)oneClick{
 [NSThread detachNewThreadSelector:@selector(doSomething:) toTarget:self withObject:@"oneClick"];
}
-(void)doSomething:(NSString*) str{
 NSLog(@"%@",str);
}
- (void)twoClick{
 NSThread* myThread = [[NSThread alloc] initWithTarget:self
             selector:@selector(doSomething:)
             object:@"twoClick"];
 [myThread start];
}

NSOperation适合需要复杂的线程调度的方法，然后它默认是使用主线程不会创建子线程

- (void)threeClick{
 // 1.创建NSInvocationOperation对象
 NSInvocationOperation *op = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run) object:nil];
 // 2.调用start方法开始执行操作
 [op start];
}
- (void)run
{
 NSLog(@"------%@", [NSThread currentThread]);
}
- (void)fourClick{
 NSBlockOperation *op = [NSBlockOperation blockOperationWithBlock:^{
  // 在主线程
  NSLog(@"1------%@", [NSThread currentThread]);
 }];
 // 添加额外的任务(在子线程执行)
 [op addExecutionBlock:^{
  NSLog(@"2------%@", [NSThread currentThread]);
 }];
 [op addExecutionBlock:^{
  NSLog(@"3------%@", [NSThread currentThread]);
 }];
 [op addExecutionBlock:^{
  NSLog(@"4------%@", [NSThread currentThread]);
 }];
 [op start];

}

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