AutoLayout那些坑

最近在作一個聊天界面,要適配iOS全部屏幕。ide

之前的思路是鍵盤彈出的時候去改table 和輸入框的frame。spa

如今發現和autolayout的約束有衝突。code

搞了半天發現須要動態改Constraint。blog

 

- (void)keyboardDidShow:(NSNotification *)notification
{
    CGRect kbFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    
    self.msgBoxBottomConstraint.constant = kbFrame.size.height;
    [self.messageBox needsUpdateConstraints];
}

-(void)keyboardDidHide:(NSNotification*)notification
{
    self.msgBoxBottomConstraint.constant = 0;
    [self.messageBox needsUpdateConstraints];
}
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