TextField焦点顺序

最新推荐文章于 2023-11-28 11:30:45 发布

原创最新推荐文章于 2023-11-28 11:30:45 发布 · 1.4k 阅读

CC 4.0 BY-SA版权

本文介绍了一个iOS应用程序如何处理键盘显示和隐藏的通知。通过监听UITextFieldTextDidBeginEditingNotification等通知来跟踪文本框编辑状态，并利用UIKeyboardWillShowNotification等通知来响应键盘的显示与隐藏。

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/**

第一次点击

UITextFieldTextDidBeginEditingNotification

UIKeyboardWillChangeFrameNotification

UIKeyboardWillShowNotification

第二次点击

UITextFieldTextDidEndEditingNotification

UITextFieldTextDidBeginEditingNotification

消失

UIKeyboardWillChangeFrameNotification

UIKeyboardWillHideNotification

UITextFieldTextDidEndEditingNotification

- (void)textFieldTextDidBeginEditing:(NSNotification *)notification {

[self.stack addObject:notification];

if ([self.stackcount] ==2) {

#warning 键盘未消失，另一文本框获得焦点

[self.stack removeAllObjects];

}

// NSConcreteNotification 0x109642c60 {name = UITextFieldTextDidBeginEditingNotification; object = <CustomTextField: 0x109539f50; baseClass = UITextField; frame = (29 142; 262 40); text = ''; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; tag = 100; gestureRecognizers = <NSArray: 0x10956f260>; layer = <CALayer: 0x10953a370>>}

}

- (void)textFieldTextDidEndEditing:(NSNotification *)notification {

[self.stack addObject:notification];

if ([self.stackcount] ==3) {

#warning 键盘消失

[self.stackremoveAllObjects];

}

// NSConcreteNotification 0x10a879190 {name = UITextFieldTextDidEndEditingNotification; object = <CustomTextField: 0x10a823660; baseClass = UITextField; frame = (29 142; 262 40); text = ''; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; tag = 100; gestureRecognizers = <NSArray: 0x10a858890>; layer = <CALayer: 0x10a823a80>>}

}

- (void)keyboardWillShow:(NSNotification *)notification {

[self.stack addObject:notification];

#warning 键盘抬起

[self.stackremoveAllObjects];

NSConcreteNotification 0x109668120 {name = UIKeyboardWillShowNotification; userInfo = {

UIKeyboardAnimationCurveUserInfoKey = 7;

UIKeyboardAnimationDurationUserInfoKey = "0.25";

UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {320, 216}}";

UIKeyboardCenterBeginUserInfoKey = "NSPoint: {160, 676}";

UIKeyboardCenterEndUserInfoKey = "NSPoint: {160, 460}";

UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 568}, {320, 216}}";