设置导航栏 self.navigationItem.titleView 居中

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-(void)viewDidLayoutSubviews{
    [self setDisplayCustomTitleText:@"每日头条"];
}

 #pragma mark - 设置导航栏 self.navigationItem.titleView 居中
 - (void)setDisplayCustomTitleText:(NSString*)text
 {
     CGFloat titleViewHeight = ;
     UIView *titleView = [[UIView alloc] initWithFrame:CGRectMake(, , Screen_Width, titleViewHeight)];
     titleView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin |UIViewAutoresizingFlexibleRightMargin;
     titleView.autoresizesSubviews = YES;
     titleView.backgroundColor = [UIColor clearColor];
     UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(, , Screen_Width, titleViewHeight)];
     titleLabel.backgroundColor = [UIColor clearColor];
     titleLabel.font = [UIFont systemFontOfSize:];
     titleLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
     titleLabel.textColor = kMyColor(, , );
     titleLabel.textAlignment = NSTextAlignmentCenter;
     CGRect leftViewbounds = self.navigationItem.leftBarButtonItem.customView.bounds;
     CGRect rightViewbounds = self.navigationItem.rightBarButtonItem.customView.bounds;

     CGRect frame;
     CGFloat maxWidth = leftViewbounds.size.width > rightViewbounds.size.width ? leftViewbounds.size.width : rightViewbounds.size.width;
     maxWidth += ;//leftview 左右都有间隙，左边是5像素，右边是8像素，加2个像素的阀值 5 ＋ 8 ＋ 2
     frame = titleLabel.frame;
     frame.size.width = Screen_Width - maxWidth * ;

     titleLabel.frame = frame;
     frame = titleView.frame;
     frame.size.width = Screen_Width - maxWidth * ;
     titleView.frame = frame;
     titleLabel.text = text;
     [titleView addSubview:titleLabel];
     self.navigationItem.titleView = titleView;
 }