您显然还没有声明AppButton。也许它的名字是appButton？大写的A表示它是一个类。您想要的是一个 UIView 对象。
AppButton
appButton
UIView
You obviously haven't declared AppButton. Maybe it's named appButton? The capital A indicates that it's a class. What you want is a UIView object.
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您显然还没有声明
AppButton。也许它的名字是appButton？大写的A表示它是一个类。您想要的是一个UIView对象。You obviously haven't declared
AppButton. Maybe it's namedappButton? The capital A indicates that it's a class. What you want is aUIViewobject.