iOS 沙箱儲存 讀取圖片

1.建立project，拖出兩個imageview和兩個button，分別關聯代碼

2.button action中加入

- (IBAction)save:(id)sender {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);    

    NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"pic.png"]];   // 儲存檔案的名稱

    

    UIImage *image1 = _myimagview1.image;

    BOOL result=[UIImagePNGRepresentation(image1)writeToFile: filePath atomically:YES];

    if (result) {

        NSLog(@"success");

    }

}

- (IBAction)read:(id)sender {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

    NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"pic.png"]];   // 儲存檔案的名稱

    UIImage *img = [UIImage imageWithContentsOfFile:filePath];

    _myimageview2.image = img;

} 3.測試