问题集

问题:Unable to run app in Simulator
描述:
An error was encountered while running (Domain = NSPOSIXErrorDomain, Code = 3)
在模拟器打开的情况下升级Xcode，安装完成之后直接运行，报错
解决：
重启模拟器

问题：*** -[DetailPageViewController scrollViewDidScroll:]: message sent to deallocated instance 0x19a13c90
描述：
viewController释放之后，scrollViewDidScroll:方法又被调用，
解决：
将调用该方法的delegate置为nil。

问题：*** -[NSIndexPath section]: message sent to deallocated instance 0x17dbc970
描述：
The app crashes when someone highlights a cell while scrolling fast, and then the OS tries to unhighlight it when it moves off screen, when it ceases to exist.
解决：
- (BOOL)collectionView:(UICollectionView *)collectionView shouldHighlightItemAtIndexPath:(NSIndexPath *)indexPath {
return NO;
}
return NO; 之后下面的方法无法执行,cell上添加UITapGestureRecognizer手势代替cell点击事件
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {}

问题: Could not load the “image.png” image
描述:
Could not load the “image.png” image referenced from a nib in the bundle with identifier “com.bundle.identifier”
解决:
将报错的图片全部从工程中删除，再添加进去

问题:CG_CONTEXT_SHOW_BACKTRACE
描述:
Oct 19 10:27:05  [2995] <Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Oct 19 10:27:05  [2995] <Error>: CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Oct 19 10:27:05  [2995] <Error>: CGContextRestoreGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
解决:
iOS9之后,info.plist中View controller-based status bar appearance设置为NO的话,就会报以上警告
使用iOS7以后的方法:
在viewController中调用
- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}
在navigationController中调用
- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}
- (UIViewController *)childViewControllerForStatusBarStyle {
    return self.topViewController;
}

问题:iOS9访问网络失败
描述:
iOS9引入了新特性App Transport Security (ATS),新特性要求App内访问的网络必须使用HTTPS协议
解决:
在Info.plist中添加NSAppTransportSecurity类型Dictionary。
在NSAppTransportSecurity下添加NSAllowsArbitraryLoads类型Boolean,值设为YES

问题:pod 安装第三方库编译报错
描述:
Unable to run command 'StripNIB XMTopCell.nib' - this target might include its own product.
Unable to run command 'StripNIB XMTopCell~iphone.nib' - this target might include its own product.
Unable to run command 'StripNIB XMTopCell~ipad.nib' - this target might include its own product.
解决:
podspec文件中添加s.resource = '*/*.xib';

问题:*** -[UIKeyboardLayoutStar release]: message sent to deallocated instance 0x7f9e7c2ccd40
解决:用自定义方法替换可变数组的原有objectAtIndex方法解决数组越界问题时，造成键盘崩溃，使用其他方法解决数组越界问题