我得到這個錯誤(void方法「撤消:」應該沒有返回值)在這行代碼:錯誤:void方法「撤消:」應該沒有返回值
return image;
什麼是錯的,不有人知道這個錯誤的解決方案?
代碼:
- (IBAction)undo:(id)sender
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
@"test.png" ];
UIImage* image = [UIImage imageWithContentsOfFile:path];
[self->_imagView setImage:image];
return image;
}
編輯:
什麼我不得不說,如果 「撤消」 按鈕被點擊圖像應返回?
代碼:
- (IBAction)undo:(id)sender
{
}
- (UIImage*)loadImage
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
@"test.png" ];
UIImage* image = [UIImage imageWithContentsOfFile:path];
return image;
}
- (void)saveImage: (UIImage*)image
{
if (image != nil)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
@"test.png" ];
NSData* data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
}
}
如果它不應該返回一個值,那麼不要返回一個值。 –