未调用UITextField上的drawTextInRect [英] drawTextInRect on UITextField not called
问题描述
我正在尝试实施这个问题的答案。问题是： - [drawTextInRect] 显然没有被调用，并在 - [drawRect] 中设置阴影不会使得UITextField的文本被遮蔽。
I'm trying to implement the answer to this SO question. The problem is: -[drawTextInRect] is apparently not called, and setting the shadow in -[drawRect] doesn't make the UITextField's text shadowed.
另一个奇怪的事情是即使我的子类实现 - [drawTextInRect] 和 - [drawRect] 是完全空的（甚至不是对super的调用），会绘制文本字段的文本。
Another weird thing is that even if my subclass implementations of -[drawTextInRect] and -[drawRect] are completely empty (not even a call to super), the textfield's text is drawn.
推荐答案
这是 UITextField API文档中的错误。该文档表明覆盖 drawTextInRect：可用于自定义行为。情况并非如此。
This is a bug in the UITextField API documentation. The documentation indicates that overriding drawTextInRect: can be used to customize behaviour. This is not the case.
事实上， drawTextInRect：永远不会在 drawPlaceholderInRect：也不会被调用）。
In fact, drawTextInRect: will never be called on an UITextField (drawPlaceholderInRect: will be called neither by the way).
参见还 http://discussions.apple.com/thread.jspa?threadID=1727596。
覆盖 UILabel 上的方法有效。
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