首页 > 代码库 > ios8调用相机报警告: Snapshotting a view that has not been rendered results in an empty snapshot. Ensure you(转)
ios8调用相机报警告: Snapshotting a view that has not been rendered results in an empty snapshot. Ensure you(转)
我这也报了这个警告,但按他的方法并没有起作用,把写到这个地方看是否其他人用的到
错误代码：Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
问题分析：iOS8在调用系统相机拍照时，会有一两秒的停顿，然后再弹出UIImagePickConroller，IOS7是没有这个问题的，在百度找了无数遍都没能解决这个问题，有说要将imagePickController设置为全局变量，有说要延时0.5秒再presentViewController的，各显神通，但很遗憾的都没能解决这个问题，今天特意单独写个Demo来研究此问题，终于取得了突破性的进展！
其实根本原因不在于系统拍照控制器上面，而是执行presentViewController这个动作本身！我们可以查看下UIViewController这个类，他有一个属性
@property(nonatomic,assign) UIModalPresentationStyle modalPresentationStyle NS_AVAILABLE_IOS(3_2); |
这是一个枚举值，在iOS7的SDK中，定义如下：
typedefNS_ENUM(NSInteger, UIModalPresentationStyle) { UIModalPresentationFullScreen = 0,#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_3_2 UIModalPresentationPageSheet, UIModalPresentationFormSheet, UIModalPresentationCurrentContext,#endif#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0 UIModalPresentationCustom, UIModalPresentationNone = -1, #endif }; |
在iOS8的SDK中定义如下：
typedefNS_ENUM(NSInteger, UIModalPresentationStyle) { UIModalPresentationFullScreen = 0, UIModalPresentationPageSheetNS_ENUM_AVAILABLE_IOS(3_2), UIModalPresentationFormSheetNS_ENUM_AVAILABLE_IOS(3_2), UIModalPresentationCurrentContextNS_ENUM_AVAILABLE_IOS(3_2), UIModalPresentationCustomNS_ENUM_AVAILABLE_IOS(7_0), UIModalPresentationOverFullScreenNS_ENUM_AVAILABLE_IOS(8_0), UIModalPresentationOverCurrentContextNS_ENUM_AVAILABLE_IOS(8_0), UIModalPresentationPopoverNS_ENUM_AVAILABLE_IOS(8_0), UIModalPresentationNoneNS_ENUM_AVAILABLE_IOS(7_0) = -1, }; |
解决问题的关键部分来了，IOS8多了一个样式UIModalPresentationOverCurrentContext，IOS8中presentViewController时请将控制器的modalPresentationStyle设置为UIModalPresentationOverCurrentContext，问题解决！！
if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0) { self.modalPresentationStyle=UIModalPresentationOverCurrentContext;} |
ios8调用相机报警告: Snapshotting a view that has not been rendered results in an empty snapshot. Ensure you(转)