xib 自动布局获取真实的frame

UIViewController 中

- (void)viewDidLayoutSubviews

{    [super viewDidLayoutSubviews];//获取真实的frame

  //  NSLog(@"xzxx %f",  _num_keyBoardView.frame.size.width);}

cell /Uiview 

-(void)layoutSubviews {

    [super layoutSubviews];

    [self setNeedsLayout];

    [self layoutIfNeeded];

    NSLog(@"%@", _contenLabel);