iOS 自定义导航栏背景，左侧按钮，右侧按钮，及标题

[self.navigationBar setBackgroundImage:[UIImage imageNamed:@"导航栏背景图"] forBarMetrics:UIBarMetricsDefault];

+ (UIImage *)buttonImageFromColor:(UIColor *)color WithSize:(CGSize)size {
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}

[self.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],NSForegroundColorAttributeName,nil]];

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
if (self.childViewControllers.count > 0) { // 如果push进来的不是第一个控制器
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"FSNavfanhui"] forState:UIControlStateNormal];
button.frame = CGRectMake(0, 0, 44, 44);
// 让按钮内部的所有内容左对齐
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
// 修改导航栏左边的item
viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
// 隐藏tabbar
viewController.hidesBottomBarWhenPushed = YES;
}
// 这句super的push要放在后面, 让viewController可以覆盖上面设置的leftBarButtonItem
[super pushViewController:viewController animated:animated];
}

- (void)back{
[self popViewControllerAnimated:YES];
}

#pragma mark - 设置返回按钮
- (void)setNavigationLeftBarTitleText:(NSString *)title{
FSButton *button = [[FSButton alloc] initWithFrame:FRAME(0, 0, 44, 44) Title:title TitleColor:HexRGB(0xffffff) BackgroundColor:[UIColor clearColor] Font:SYSTEM_FONT(14) State:UIControlStateNormal];
// 让按钮内部的所有内容左对齐
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

// 修改导航栏左边的item
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
}
#pragma mark - 返回点击事件
- (void)back{
[self.navigationController popViewControllerAnimated:YES];
}

/**
*  右侧按钮点击事件
*/
@property(nonatomic, copy) void (^fs_rightBtnClickBlock)(FSButton * fs_rightBtn);

/**
* 根据文字设定右侧按钮
*/
- (void)setNavigationBarRightItemWithTitle:(NSString *)title actionBlock:(void (^)(FSButton *button))actionBlock{
FSButton *button = [[FSButton alloc] initWithFrame:FRAME(0, 0, 44, 44) Title:title TitleColor:HexRGB(0xffffff) BackgroundColor:[UIColor clearColor] Font:SYSTEM_FONT(14) State:UIControlStateNormal];
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
[button addTarget:self action:@selector(fs_rightBtnClick:) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.fs_rightBtnClickBlock = actionBlock;
}

#pragma mark - 右侧按钮点击事件
- (void)fs_rightBtnClick:(FSButton *)sender{
self.fs_rightBtnClickBlock(sender);
}

/**
* 根据图片设定右侧按钮方法
*/
- (void)setNavigationBarRightItemWithImage:(NSString *)imageName actionBlock:(void (^)(FSButton *))actionBlock{
FSButton *button = [[FSButton alloc] initWithFrame:FRAME(0, 0, 44, 44)];
[button setImage:IMAGE_NAMED(imageName) forState:UIControlStateNormal];
[button addTarget:self action:@selector(fs_rightBtnClick:) forControlEvents:UIControlEventTouchUpInside];
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.fs_rightBtnClickBlock = actionBlock;
}

#pragma mark - 右侧按钮点击事件
- (void)fs_rightBtnClick:(FSButton *)sender{
self.fs_rightBtnClickBlock(sender);
}

/**
* 设定右侧按钮方法
*/
- (void)setNavigationBarRightItemWithTitleForNormal:(NSString *)titleForNormal titleForDisable:(NSString *)titleForDisable colorForNormal:(UIColor *)colorForNormal colorForDisable:(UIColor *)colorForDisable actionBlock:(void (^)(FSButton *))actionBlock{
FSButton *button = [[FSButton alloc] initWithFrame:FRAME(0, 0, 44, 44)];
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
[button.titleLabel setFont:SYSTEM_FONT(14)];
[button setTitle:titleForNormal forState:UIControlStateNormal];
[button setTitleColor:colorForNormal forState:UIControlStateNormal];
[button setTitle:titleForDisable forState:UIControlStateDisabled];
[button setTitleColor:colorForDisable forState:UIControlStateDisabled];
[button addTarget:self action:@selector(fs_rightBtnClick:) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];

//    [self.navigationItem.rightBarButtonItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:colorForNormal, NSForegroundColorAttributeName,nil] forState:UIControlStateNormal];
//    [self.navigationItem.rightBarButtonItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:colorForDisable, NSForegroundColorAttributeName,nil] forState:UIControlStateDisabled];
self.fs_rightBtnClickBlock = actionBlock;
}
#pragma mark - 右侧按钮点击事件
- (void)fs_rightBtnClick:(FSButton *)sender{
self.fs_rightBtnClickBlock(sender);
}

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame= CGRectMake(0, 0, 44, 44);
[btn addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *btn_right = [[UIBarButtonItem alloc] initWithCustomView:btn];
UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]   initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace   target:nil action:nil];

/**
width为负数时，相当于btn向右移动width数值个像素，由于按钮本身和  边界间距为5pix，所以width设为-5时，间距正好调整为0；width为正数 时，正好相反，相当于往左移动width数值个像素
*/
negativeSpacer.width = -5;
self.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects:negativeSpacer, btn_right, nil];