Objective c IOS 8目标反犹主义行动不起作用

我使用uibarbuttonim操作，它在ios 7上工作，而不是在ios 8上 在ios 7中，单击按钮后，cancelButtonPressed方法（在action中定义）正在运行，但在ios 8中没有发生任何事情cancelButtonPressed方法没有调用

 id cancelButton = [[UIBarButtonItem alloc]
                       initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                       target:self
                       action:@selector(cancelButtonPressed:)
                       ];

我在条形码扫描仪插件中使用它，它打开相机，在该屏幕中我有取消按钮：

- (UIView*)buildOverlayView {

    if ( nil != self.alternateXib )
    {
        return [self buildOverlayViewFromXib];
    }
    CGRect bounds = self.view.bounds;
    bounds = CGRectMake(0, 0, bounds.size.width, bounds.size.height);

    UIView* overlayView = [[[UIView alloc] initWithFrame:bounds] autorelease];
    overlayView.autoresizesSubviews = YES;
    overlayView.autoresizingMask    = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    overlayView.opaque              = NO;

    UIToolbar* toolbar = [[[UIToolbar alloc] init] autorelease];
    toolbar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;




    id cancelButton = [[UIBarButtonItem alloc]
                       initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                       target:self
                       action:@selector(cancelButtonPressed:)
                       ];
    //self.navigationItem.rightBarButtonItem=cancelButton;


    id flexSpace = [[[UIBarButtonItem alloc] autorelease]
                    initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                    target:nil
                    action:nil
                    ];

#if USE_SHUTTER
    id shutterButton = [[UIBarButtonItem alloc]
                        initWithBarButtonSystemItem:UIBarButtonSystemItemCamera
                        target:(id)self
                        action:@selector(shutterButtonPressed)
                        ];

    toolbar.items = [NSArray arrayWithObjects:flexSpace,cancelButton,flexSpace,shutterButton,nil];
#else
    toolbar.items = [NSArray arrayWithObjects:flexSpace,cancelButton,flexSpace,nil];
#endif
    bounds = overlayView.bounds;

    [toolbar sizeToFit];
    CGFloat toolbarHeight  = [toolbar frame].size.height;
    CGFloat rootViewHeight = CGRectGetHeight(bounds);
    CGFloat rootViewWidth  = CGRectGetWidth(bounds);
    CGRect  rectArea       = CGRectMake(0, rootViewHeight - toolbarHeight, rootViewWidth, toolbarHeight);
    [toolbar setFrame:rectArea];

    [overlayView addSubview: toolbar];

    UIImage* reticleImage = [self buildReticleImage];
    UIView* reticleView = [[[UIImageView alloc] initWithImage: reticleImage] autorelease];
    CGFloat minAxis = MIN(rootViewHeight, rootViewWidth);

    rectArea = CGRectMake(
                          0.5 * (rootViewWidth  - minAxis),
                          0.5 * (rootViewHeight - minAxis),
                          minAxis,
                          minAxis
                          );

    [reticleView setFrame:rectArea];

    reticleView.opaque           = NO;
    reticleView.contentMode      = UIViewContentModeScaleAspectFit;
    reticleView.autoresizingMask = 0
    | UIViewAutoresizingFlexibleLeftMargin
    | UIViewAutoresizingFlexibleRightMargin
    | UIViewAutoresizingFlexibleTopMargin
    | UIViewAutoresizingFlexibleBottomMargin
    ;

    [overlayView addSubview: reticleView];

    return overlayView;
}

---

在ios8上使用它的替代方法是什么？

您可能希望在类定义中使用全局变量或cancelButton的属性，而不是使用局部变量。我猜arc正在从内存中删除cancelButton。

在第三个千年中，您是否仍然没有使用arc。启用ARC。2.使用现代Objective-C语法。3.参见1.快门按钮是否正常工作？如果只添加“取消”按钮而不添加其他内容，会发生什么情况？我正在使用条形码扫描仪插件，并且Arc被禁用，我没有找到任何使用Arc的ios条形码扫描仪。你认为这个问题与ARC有关吗？你能分享更多的代码和你在哪里初始化那个bar按钮吗，当我使用你的代码时，取消按钮方法在2分钟后立即被触发。我在这方面没有得到任何有用的东西，因此我可以纠正你的代码中出现的问题。IM使用条形码扫描仪插件，Arc被禁用。我没有找到任何使用Arc的ios条形码扫描仪。

remove autorelease and initialize bar button like that

 id cancelButton = [[UIBarButtonItem alloc]
                   initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                   target:self
                   action:@selector(cancelButtonPressed:)
                   ];
 self.navigationItem.rightBarButtonItem=cancelButton;