ios9微信支付报警告: Snapshotting a view that has not been rendered results in an empty snapshot. Ensure yo

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.

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！！

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