iOS全域處理鍵盤事件

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轉自：http://www.cnblogs.com/xinus/archive/2013/01/22/ios-keybord-notification.html

1. 註冊監聽鍵盤事件的通知
   

       [[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. 在鍵盤將要出現和隱藏的回調中，加入動畫。
   

   - (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;    }}

    

iOS全域處理鍵盤事件