从枚举类型'enum UIControlEvents‘到不同枚举类型'UIControlState’(又名'enum UIControlState')的隐式转换

Question

我正在使用Xcode 5.0.2，并在编译目标C代码时收到以下警告：

**Implicit conversion from enumeration type 'enum UIControlEvents' to different enumeration type 'UIControlState' (aka 'enum UIControlState')**

警告在abcLabel.m中

[searchBtn setTitleColor:[UIColor whiteColor] forState:**UIControlEventTouchUpInside**];

Answer 1

您应该使用UIControlState枚举，例如：

[searchBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];

您可以从以下选项中选择：

enum {
   UIControlStateNormal               = 0,
   UIControlStateHighlighted          = 1 << 0,
   UIControlStateDisabled             = 1 << 1,
   UIControlStateSelected             = 1 << 2,
   UIControlStateApplication          = 0x00FF0000,
   UIControlStateReserved             = 0xFF000000
};

当要向控件添加事件时，应该使用UIControlEvent，例如按下句柄按钮。