NSOperation

前面了解了GCD也比较详细，所以Thread和NSOperation大概了解一下。参考：http://blog.csdn.net/crycheng/article/details/21799611

还是上代码

//

// ViewController.m

// Operation

// Created by City--Online on 15/4/1.

// Copyright (c) 2015年 City--Online. All rights reserved.

#import "ViewController.h"

@interface ViewController ()

 UIButton *btn;

 NSBlockOperation *blockoperation;

@implementation ViewController

- (void)viewDidLoad {

 [super viewDidLoad];

 btn=[UIButton buttonWithType:UIButtonTypeCustom];

 [btn setTitle:@"按钮" forState:UIControlStateNormal];

 btn.backgroundColor=[UIColor redColor];

 btn.frame=CGRectMake(30, 30, 50, 50);

 [btn addTarget:self action:@selector(btnclick:) forControlEvents:UIControlEventTouchUpInside];

 [self.view addSubview:btn];

 NSInvocationOperation *operation=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(threadfun) object:nil];

 NSOperationQueue *operationqueue=[[NSOperationQueue alloc]init];

 [operationqueue addOperation:operation];

 blockoperation=[NSBlockOperation blockOperationWithBlock:^{

 NSLog(@"blockoperation");

-(void)btnclick:(id)sender

 //增加block到线程中

 [blockoperation addExecutionBlock:^{

 NSLog(@"addExecutionBlock");

 [blockoperation setCompletionBlock:^{

 NSLog(@"setCompletionBlock");

 [blockoperation start];//不能放在addExecutionBlock之前start

-(void)threadfun

 NSLog(@"threadfun");

 //更新主线程

 [self performSelectorOnMainThread:@selector(updateUI) withObject:nil waitUntilDone:NO];

-(void)updateUI

 NSLog(@"uodateUI");

 [btn setTitle:@"123" forState:UIControlStateNormal];

- (void)didReceiveMemoryWarning {

 [super didReceiveMemoryWarning];

 // Dispose of any resources that can be recreated.

@end

配合使用 NSOperation 和 NSOperationQueue 也能实现多线程编程； NSOperation 和 NSOperationQueue 实现多线程的具体步骤 先将需要执行的操作封装到一个 NS...
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