- (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];}

- (void)threeClick{ // 1.創建NSInvocationOperation對象 NSInvocationOperation *op = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run) object:nil]; // 2.調用start方法開始執行操作 [op start];}- (void)run{ NSLog(@"------%@", [NSThread currentThread]);}- (void)fourClick{ NSBlockOperation *op = [NSBlockOperation blockOperationWithBlock:^{  // 在主線程  NSLog(@"1------%@", [NSThread currentThread]); }]; // 添加額外的任務(在子線程執行) [op addExecutionBlock:^{  NSLog(@"2------%@", [NSThread currentThread]); }]; [op addExecutionBlock:^{  NSLog(@"3------%@", [NSThread currentThread]); }]; [op addExecutionBlock:^{  NSLog(@"4------%@", [NSThread currentThread]); }]; [op start];}