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我有一个简单的问题,但它让我感到困惑。下面的代码为UIControlTouchUpInside获取了一个UNDEFINED错误。我需要包含或导入什么?如果我注释掉这一行,它就会起作用。这意味着forState:UIControlStateNormal被定义。我是新人,所以希望你能帮助。为什么UIControlTouchUpInside UNDEFINED?
UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Accept?" forState:UIControlStateNormal];
[button addTarget:self action:@selector(acceptTapped) forControlEvents:UIControlTouchUpInside];