- (void)viewDidLoad {
[super viewDidLoad];
NSString *urlString = @"http://xxxxxxx.png";
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]];
UIImage *image = [UIImage imageWithData:data]; // 取得图片
// 本地沙盒目录
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
// 得到本地沙盒中名为"MyImage"的路径，"MyImage"是保存的图片名
NSString *imageFilePath = [path stringByAppendingPathComponent:@"MyImage"];
// 将取得的图片写入本地的沙盒中，其中0.5表示压缩比例，1表示不压缩，数值越小压缩比例越大
BOOL success = [UIImageJPEGRepresentation(image, 0.5) writeToFile:imageFilePath atomically:YES];
if (success){
NSLog(@"写入本地成功");
}
UIImageView *imagView = [[UIImageView alloc]initWithFrame:CGRectMake(20, 20, 100, 100)];
UIImage *img = [UIImage imageWithContentsOfFile:imageFilePath];
imagView.image = img;
[self.view addSubview:imagView];
}
