ios8调用相机报警告: Snapshotting a view that has not been rendered results in an empty snapshot. Ensure you

Posted 2020-08-14

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

[Objective-C] 纯文本查看 复制代码

@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：

[Objective-C] 纯文本查看 复制代码

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：

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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！！

[Objective-C] 纯文本查看 复制代码

if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0) {     self.modalPresentationStyle=UIModalPresentationOverCurrentContext; }