iOS--线程间通讯NSThread--04

来源：互联网发布：信息科技公司域名编辑：程序博客网时间：2024/06/06 09:27

1.回到主线程，刷新UI界面(为了线程安全)

#import "HMViewController.h"@interface HMViewController ()@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation HMViewController- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    [self performSelectorInBackground:@selector(download) withObject:nil];}/** *  下载图片 */- (void)download{    NSLog(@"download---%@", [NSThread currentThread]);    // 1.图片地址    NSString *urlStr = @"http://d.hiphotos.baidu.com/image/pic/item/37d3d539b6003af3290eaf5d362ac65c1038b652.jpg";    NSURL *url = [NSURL URLWithString:urlStr];    // 2.根据地址下载图片的二进制数据(这句代码最耗时)    NSLog(@"---begin");    NSData *data = [NSData dataWithContentsOfURL:url];    NSLog(@"---end");    // 3.设置图片    UIImage *image = [UIImage imageWithData:data];    // 4.回到主线程，刷新UI界面(为了线程安全)    [self performSelectorOnMainThread:@selector(downloadFinished:) withObject:image waitUntilDone:NO];//    [self performSelector:@selector(downloadFinished:) onThread:[NSThread mainThread] withObject:image waitUntilDone:YES];//    [self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:YES];    NSLog(@"-----done----");}- (void)downloadFinished:(UIImage *)image{    self.imageView.image = image;    NSLog(@"downloadFinished---%@", [NSThread currentThread]);}

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