- (void)viewDidLoad {
[super viewDidLoad];
NSString *urlString = @"http://xxxxxxx.png";
NSData *data = [NSData dataWithContentsOfURL:[NSURL? URLWithString:urlString]];
UIImage *image = [UIImage imageWithData:data]; // 取得圖片
// 本地沙盒目錄
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
// 得到本地沙盒中名為"MyImage"的路徑，"MyImage"是保存的圖片名
NSString *imageFilePath = [path stringByAppendingPathComponent:@"MyImage"];
// 將取得的圖片寫入本地的沙盒中，其中0.5表示壓縮比例，1表示不壓縮，數值越小壓縮比例越大
BOOL success = [UIImageJPEGRepresentation(image, 0.5) writeToFile:imageFilePath? atomically:YES];
if (success){
NSLog(@"寫入本地成功");
}
UIImageView *imagView = [[UIImageView alloc]initWithFrame:CGRectMake(20, 20, 100, 100)];
UIImage *img = [UIImage imageWithContentsOfFile:imageFilePath];
imagView.image = img;
[self.view addSubview:imagView];
}
