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// DYFViewController.m// 623-06-线程间的通信//// Created by dyf on 14-6-23.// Copyright (c) 2014年 ___FULLUSERNAME___. All rights reserved.//#import "DYFViewController.h"@interface DYFViewController ()@property (weak, nonatomic) IBOutlet UIImageView *imaV;@end@implementation DYFViewController- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib.}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ // 1.下载图片 [self performSelector:@selector(download) withObject:nil]; // 显示、刷新界面，只能在主界面 // 2.显示图片}/** * 下载图片：子线程 */- (void)download{ // 1.根据URL下载图片 NSLog(@"---------begin"); NSData *data = [NSData dataWithContentsOfURL:url]; // 耗时 NSLog(@"-----------end"); UIImage *image = [UIImage imageWithData:data]; // 2.回到主线程显示图片// [self.imaV performSelector:@selector(setImage:) onThread:[NSThread mainThread] withObject:image waitUntilDone:NO modes:nil]; //[self performSelectorOnMainThread:@selector(settingImage:) withObject:nil waitUntilDone:NO]; [self.imaV performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];}/** * 显示图片：主线程 * * @param image image */- (void)settingImage:(UIImage *)image{ self.imaV.image = image;}@end小结：主线程与子线程之间的通信
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原文地址：http://www.cnblogs.com/Cheetah-yang/p/4664148.html
