使用cordova開發ios項目的時候，在上傳圖片碰到一個問題。使用html的<input type="file"/>標籤來選擇照片或者拍照片，引起了佈局報錯，然後圖片上傳過程中很容易崩潰閃退。
html頁面代碼：
<html><head></head>
<body>
<input type="file" />
</body>
</html>然後在真機測試，點擊選擇文件，控制檯出現佈局報錯日誌：
Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) 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 - 32>
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.然後上傳圖片或者視頻的時候，常會出現崩潰閃退現象。在cordova和phonegap搜了下，沒搜到解決的辦法，不知道哪位兄臺又碰到這個問題麼，指點我一下！
完整cordova for ios demo下載：http://download.csdn.net/detail/tandaxia/9455872