Xcode数字键盘，带十进制错误

Question

在xcode中打开文本字段的.xib中的十进制键盘键盘选项，然后运行应用程序，我收到此错误：

Jun 13 01:22:38 Nicholas-Gibsons-iPhone Quick Utilities[1009] <Error>: 
CGContextSetFillColorWithColor: invalid context 0x0. This is a serious error. This 
application, or a library it uses, is using an invalid context  and is thereby 
contributing to an overall degradation of system stability and reliability. This notice is 
a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

如果您知道这意味着什么，那么您将获得很多帮助！非常感谢！

Answer 1

尝试以下方法：

textField.keyboardType = UIKeyboardTypeDecimalPad;

Answer 2

检查您是否在任何地方使用上下文 - 如果是这样，请将其重命名。