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並前往https://stackovergo.com/es/q/1959190/why-calling-self-becomefirstresponder-caused-so-many-problems

Why calling [self becomeFirstResponder] caused so many ...

The weird part is that even with the [self becomeFirstResponder] line, everything worked just fine in the new iOS 5 (simulator and device), ...

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查詢 「becomeFirstResponder」的人也找了：

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  6. isFirstResponder
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