设置导航栏 self.navigationItem.titleView 居中

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

 1 #pragma mark - 设置导航栏 self.navigationItem.titleView 居中
 2 - (void)setDisplayCustomTitleText:(NSString*)text
 3 {
 4     CGFloat titleViewHeight = 44;
 5     UIView *titleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, Screen_Width, titleViewHeight)];
 6     titleView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin |UIViewAutoresizingFlexibleRightMargin;
 7     titleView.autoresizesSubviews = YES;
 8     titleView.backgroundColor = [UIColor clearColor];
 9     UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, Screen_Width, titleViewHeight)];
10     titleLabel.backgroundColor = [UIColor clearColor];
11     titleLabel.font = [UIFont systemFontOfSize:25];
12     titleLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
13     titleLabel.textColor = kMyColor(37, 171, 39);
14     titleLabel.textAlignment = NSTextAlignmentCenter;
15     CGRect leftViewbounds = self.navigationItem.leftBarButtonItem.customView.bounds;
16     CGRect rightViewbounds = self.navigationItem.rightBarButtonItem.customView.bounds;
17 
18     CGRect frame;
19     CGFloat maxWidth = leftViewbounds.size.width > rightViewbounds.size.width ? leftViewbounds.size.width : rightViewbounds.size.width;
20     maxWidth += 15;//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
21     frame = titleLabel.frame;
22     frame.size.width = Screen_Width - maxWidth * 2;
23     
24     titleLabel.frame = frame;
25     frame = titleView.frame;
26     frame.size.width = Screen_Width - maxWidth * 2;
27     titleView.frame = frame;
28     titleLabel.text = text;
29     [titleView addSubview:titleLabel];
30     self.navigationItem.titleView = titleView;
31 }