UIImagePickerController

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{
//將ImagePicker取得的圖片指定給我們的ImageView
myImageView.image=image;

//將取得的UIImage轉換為PNG格式的NSData
NSData *imageData = UIImagePNGRepresentation(image);

//自行指定儲存的檔名
NSString *paths=NSTemporaryDirectory();
NSString *filename=@"temp.png";
NSString *pathoffilesave=[paths stringByAppendingPathComponent:filename];

//儲存
[imageData writeToFile:pathoffilesave atomically:NO];

//關閉ImagePicker
[picker dismissModalViewControllerAnimated:YES];
}