Question

我有一个空白的屏幕，我点击相机按钮并拍照，然后我的空白屏幕上显示的照片为UIVIew，我将多个图像从相机添加到空白屏幕。问题是有时我可以在空白屏幕上添加多个图像，但有时当我捕获图像时，空白屏幕上的所有图像都会消失，只显示当前图像。在LOG中。它告诉我收到内存警告。这是我的代码。我想我现在正确发布我的对象。但是当我最后添加[对象发布]时，我的应用程序崩溃了。

   -(void)AddImagesToCanvasWithGesture{

    if(imageFromPicker.size.width > imageFromPicker.size.height || imageFromPicker.size.width == imageFromPicker.size.height)
    {
        holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 180, 160)];
    }
    else{
        holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 160, 240)];
    }
    UIImageView *imageview = [[[UIImageView alloc] initWithFrame:[holderView frame]];
    [imageview setImage:imageFromPicker];
    //[imageview setTag:101];
    //[holderView setTag:102];
    //NSLog(@"Tag By Default %d",(arc4random()%100)+10);
    [holderView setTag:(int)objectDelegate.tagForHolderView];
    [imageview setTag:((int)objectDelegate.tagForHolderView)+1];
    [holderView addSubview:imageview];
    //[imageview canBecomeFirstResponder];

    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)];
    [pinchRecognizer setDelegate:self];
    [holderView addGestureRecognizer:pinchRecognizer];

    UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    [rotationRecognizer setDelegate:self];
    [holderView addGestureRecognizer:rotationRecognizer];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [panRecognizer setDelegate:self];
    [holderView addGestureRecognizer:panRecognizer];

    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
    [tapRecognizer setNumberOfTapsRequired:1];
    [tapRecognizer setDelegate:self];
    [holderView addGestureRecognizer:tapRecognizer]; 


    UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(gestureHandler:)];
    [holderView addGestureRecognizer:gestureRecognizer];

    [holderView.layer setBorderColor: [[UIColor whiteColor] CGColor]];
    [holderView.layer setBorderWidth: 3.0];
    [self.view addSubview:holderView];
    objectDelegate.tagForHolderView+=2;
    for(UIButton *b in self.view.subviews) {
        if([b isKindOfClass:[UIButton class]]) {
            [self.view bringSubviewToFront:b];
        }

        [self.view sendSubviewToBack:imageViewForBackground];
        //[holderView setHidden:YES];

    }

}

我如何发布它们以及我应该在哪里调用release方法。

Answer 1

从上面添加的代码段中可以看出，您没有正确释放对象。您拥有init或retain或copy的所有对象，除非您使用ARC，否则您有责任释放它们。（上面的代码适用于ARC）。

您拥有所有手势识别器和图像视图的所有权，您应该在不再需要它们时立即释放它们。例如...... imageView对象必须在

之后释放

[holderView addSubview:imageview];

和

pinchRecognizer应该在

之后立即发布

[holderView addGestureRecognizer:pinchRecognizer];

其他手势识别器也是如此。

我猜你的代码的其他部分也有类似的问题，最终应用会收到内存警告。

Answer 2

当您遇到内存问题时，如果您有一个名为

的方法

- (void)didReceiveMemoryWarning

它会被调用并允许你释放空间。如果您使用ARC，只需将UIImageView设置为nil，否则请调用：

[imageview release];

IOS中的内存管理问题（收到内存警告。）

2 个答案: