使用cordova开发ios项目的时候，在上传图片碰到一个问题。使用html的<input type="file"/>标签来选择照片或者拍照片，引起了布局报错，然后图片上传过程中很容易崩溃闪退。
html页面代码：
<html><head></head>
<body>
<input type="file" />
</body>
</html>
然后在真机测试，点击选择文件，控制台出现布局报错日志：
Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
() look at each constraint and try to figure out which you don't expect;
() find the code that added the unwanted constraint or constraints and fix it.
(
"<NSLayoutConstraint:0x156734e0 UILabel:0x1568b9f0.width == UIView:0x155d9110.width - 32>",
"<NSLayoutConstraint:0x1568db80 UIView:0x155d9110.width == UIView:0x155d8fc0.width>",
"<NSLayoutConstraint:0x156913b0 H:[UIView:0x155d8fc0(30)]>"
) Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x156734e0 UILabel:0x1568b9f0.width == UIView:0x155d9110.width - > Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
然后上传图片或者视频的时候，常会出现崩溃闪退现象。在cordova和phonegap搜了下，没搜到解决的办法，不知道哪位兄台又碰到这个问题么，指点我一下！
完整cordova for ios demo下载：http://download.csdn.net/detail/tandaxia/9455872