ios8调用相机报警告: Snapshotting a view that has not been rendered results in an empty snapshot. Ensure you
2015-04-01 19:50
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转载自： http://bbs.yusian.com/thread-10352-1-1.html
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
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
在iOS8的SDK中定义如下：[Objective-C] 纯文本查看 复制代码
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
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
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