修改Navigationcontroller的title字体大小:
NSString *title = @"标题";
CGSize titleSize = [title sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:EQAdapter(15)]}];
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake((SCREEN_WIDTH - titleSize.width)/ 2, (SCREEN_HEIGHT - titleSize.height) / 2, titleSize.width, titleSize.height)];
titleLabel.text = title;
titleLabel.textColor = [UIColor whiteColor];
self.navigationItem.titleView = titleLabel;