iOS App中监听键盘 iOS应用开发中监听键盘事件的代码实例小结

时间:2021-03-23 心有思人气:0

想了解iOS应用开发中监听键盘事件的代码实例小结的相关内容吗，心有思在本文为您仔细讲解iOS App中监听键盘的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：iOS,监听键盘,键盘,键盘事件，下面大家一起来学习吧。

1.注册监听键盘事件的通知

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];

2.在键盘将要出现和隐藏的回调中，加入动画

复制代码代码如下:

- (void)keyboardWillShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }

    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat y = rect.origin.y;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {

        CGFloat maxY = CGRectGetMaxY(sub.frame);
        if (maxY > y - 2) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

- (void)keyboardWillHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

3.监听键盘删除键之非代理实现
在UITextField 和 UITextView ，如何监听到删除键。

我看到网上都是用代理监听的，我觉得不靠谱。

其实苹果已经写的很清楚了。

就在他们实现的协议里面～～

复制代码代码如下:

NS_CLASS_AVAILABLE_IOS(2_0) @interface UITextView : UIScrollView<UITextInput>
@protocol UITextInput<UIKeyInput>
@protocol UIKeyInput <UITextInputTraits>

- (BOOL)hasText;

- (void)insertText:(NSString *)text;

- (void)deleteBackward;

@end

写的非常清楚，一看就明白。

－deleteBackward 这个方法就是删除按钮监听。

只要自己写个子类，重写此方法就能监听。

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