iphone - iPhone 中 textfieldshouldendediting 和 textfieldDidendediting 之间的区别

Question

textFieldShouldendEditing 和 textfieldDidEndEditing 有什么区别，什么时候应该使用每种方法？

Answer 1

textFieldShouldEndEditing:

Asks the delegate if editing should stop in the specified text field.

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField

Discussion This method is called when the text field is asked to resign the first responder status. This might occur when your application asks the text field to resign focus or when the user tries to change the editing focus to another control. Before the focus actually changes, however, the text field calls this method to give your delegate a chance to decide whether it should.

Normally, you would return YES from this method to allow the text field to resign the first responder status. You might return NO, however, in cases where your delegate detects invalid contents in the text field. By returning NO, you could prevent the user from switching to another control until the text field contained a valid value.

textFieldDidEndEditing:

Tells the delegate that editing stopped for the specified text field.

- (void)textFieldDidEndEditing:(UITextField *)textField

讨论在文本字段退出其第一响应者状态后调用此方法。您可以使用此方法更新委托(delegate)的状态信息。例如，您可以使用此方法来隐藏只应在编辑时可见的叠加 View 。委托(delegate)对这个方法的实现是可选的。

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textFieldShouldEndEditing

textFieldDidEndEditing