系统请求方式下载图片

来源：互联网发布：音频剪切合并软件编辑：程序博客网时间：2024/05/20 15:11

在.h文件中写入需要使用 NSURLConnectionDataDelegate 协议

@property (nonatomic, assign) IBOutlet UIImageView *imageView;

- (IBAction)download;

在.m文件中写入

@property (nonatomic, retain) NSMutableData *data; 定义一个数组

//释放资源

- (void)dealloc {
    [_data release];
    [super dealloc];
}

- (void)viewDidUnload {
    [super viewDidUnload];
    self.data = nil;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)download {

    self.data = [NSMutableData data];

    NSURL *url = [NSURL URLWithString:@"http://192.168.1.106:8080/meitu.png"];

    NSURLRequest *reuqest = [NSURLRequest requestWithURL:url];

    [[NSURLConnection connectionWithRequest:reuqest delegate:self] start];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.data appendData:data];
}

//下载结束后调用的方法
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    UIImage *image = [UIImage imageWithData:self.data];
    NSLog(@"下载完毕");
    self.imageView.image = image;
}