在群里看到有人问:ios如何判断键盘已经显示在界面上。
其实这个解决很简单:
写一个单例来管理键盘的状态。
这个单例在初始化方法init种监听2个事件,分别是
UIKeyboardDidShowNotification(键盘弹出通知)和
UIKeyboardWillHideNotification (键盘消失通知 然后在相应的方法中设置一个属性就行了。
大致的实现如下:
-(id)init { self = [super init]; if (self) { NSNotificationCenter *center = [NSNotificationCenter defaultCenter]; [center addObserver:self selector:@selector(keyboardDidShow) name:UIKeyboardDidShowNotification object:nil]; [center addObserver:self selector:@selector(keyboardDidHide) name:UIKeyboardWillHideNotification object:nil]; _keyboardIsVisible = NO; } return self; } - (void)keyboardDidShow { _keyboardIsVisible = YES; } - (void)keyboardDidHide { _keyboardIsVisible = NO; } - (BOOL)keyboardIsVisible { return _keyboardIsVisible; }
转载自:http://blog.sina.com.cn/s/blog_6531b9b80101c20u.html
参考:http://www.cnblogs.com/xinus/archive/2013/01/22/ios-keybord-notification.html