UINavigationBar的简单实用

==================navi bar 是否是半透明======================

    self.navigationController.navigationBar.translucent = NO;

==================黑色背景，白色状态栏======================

    [self.navigationController.navigationBar setBarStyle:UIBarStyleBlack];

=================白色背景，黑色状态栏======================

    //白色背景，黑色状态栏    [self.navigationController.navigationBar setBarStyle:UIBarStyleDefault];

====================bar的tintColor=========================

    [self.navigationController.navigationBar setBarTintColor:[UIColor greenColor]];    [self.navigationController.navigationBar setTintColor:[UIColor greenColor]];

=====================设置title颜色和大小==================

    [self.navigationController.navigationBar setTitleTextAttributes:         [NSDictionary dictionaryWithObjectsAndKeys:                 [UIColor orangeColor], NSForegroundColorAttributeName,                   [UIFont boldSystemFontOfSize:22], NSFontAttributeName,nil]    ];

====================设置返回键图标==================

    UIImage *image = [UIImage imageNamed:@"icon_back_black"];    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    self.navigationController.navigationBar.backIndicatorImage = image    self.navigationController.navigationBar.backIndicatorTransitionMaskImage = image;

======================设置bar的底线===================

    //设置bar的底线    [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];    [self.navigationController.navigationBar setShadowImage:[self imageWithColor:[UIColor redColor]]];    [self.navigationController.navigationBar setShadowImage:[UIImage imageNamed:@"barShadow"]];- (UIImage *)imageWithColor:(UIColor *)color{    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetFillColorWithColor(context, [color CGColor]);    CGContextFillRect(context, rect);    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}

Example

#import <UIKit/UIKit.h>@interface UIViewController (WNNavigationBar)//不传bartintcolor的情况下和默认情况下 是 default。也就是状态栏为黑色字体@property (nonatomic,assign) BOOL isDefaultBarStyle;//设置tintColor@property (nonatomic,strong) UIColor *wnBarTintColor;@end

////  UIViewController+WNNavigationBar.m//  danche////  Created by WNRS on 2017/6/12.//  Copyright © 2017年 wuna. All rights reserved.//#import "UIViewController+WNNavigationBar.h"#import "UINavigationController+FDFullscreenPopGesture.h"@implementation UIViewController (WNNavigationBar)+ (void)load{    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        Class class = [self class];        SEL originalSelector = @selector(viewWillAppear:);        SEL swizzledSelector = @selector(wn_viewWillAppear:);        Method originalMethod = class_getInstanceMethod(class, originalSelector);        Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);        BOOL success = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));        if (success) {            class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));        } else {            method_exchangeImplementations(originalMethod, swizzledMethod);        }    });}- (void)wn_viewWillAppear:(BOOL)animated{    // Forward to primary implementation.    [self wn_viewWillAppear:animated];    if (self.isDefaultBarStyle) {   //白色navigationbar         self.navigationController.navigationBar.barStyle = UIBarStyleDefault;        [self.navigationController.navigationBar setBarTintColor:[UIColor whiteColor]];        [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor], NSForegroundColorAttributeName, [UIFont boldSystemFontOfSize:18], NSFontAttributeName,nil]];        [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];        self.navigationController.navigationBar.translucent = NO;        //--        UIImage *image = [UIImage imageNamed:@"icon_back_black"];        image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];        self.navigationController.navigationBar.backIndicatorImage = image;        self.navigationController.navigationBar.backIndicatorTransitionMaskImage = image;        [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];        [self.navigationController.navigationBar setShadowImage:[UIImage imageNamed:@"barShadow"]];    }else{  //黑色navigationbar        self.navigationController.navigationBar.barStyle = UIBarStyleBlackTranslucent;        [self.navigationController.navigationBar setBarTintColor:self.wnBarTintColor?self.wnBarTintColor:HexRGB(0x3A3A3A)];        [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName, [UIFont boldSystemFontOfSize:18], NSFontAttributeName,nil]];        [self.navigationController.navigationBar setTintColor:HexRGB(0x3A3A3A)];        self.navigationController.navigationBar.translucent = NO;        //--        UIImage *image = [UIImage imageNamed:@"icon_back"];        image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];        self.navigationController.navigationBar.backIndicatorImage = image;        self.navigationController.navigationBar.backIndicatorTransitionMaskImage = image;        [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];        [self.navigationController.navigationBar setShadowImage:[UIImage imageNamed:@"barShadow"]];        /**         *shadowimage = [UIImage alloc] init] 时没有横线         *shadowimage = nil 时有一根线         *shadowimage = [UIImage imageNamed:@"barShadow"]] 时有带阴影的线         */    }}#pragma mark -- setter and getter//--isDefaultBarStyle--- (void)setIsDefaultBarStyle:(BOOL)isDefaultBarStyle{    objc_setAssociatedObject(self, @selector(isDefaultBarStyle), @(isDefaultBarStyle), OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (BOOL)isDefaultBarStyle{    NSNumber *number = objc_getAssociatedObject(self, _cmd);    if (number) {        return number.boolValue;    }    self.isDefaultBarStyle = YES;    return YES;}//--wnBarTintColor--- (void)setWnBarTintColor:(UIColor *)wnBarTintColor{    objc_setAssociatedObject(self, @selector(wnBarTintColor), wnBarTintColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (UIColor *)wnBarTintColor{    return objc_getAssociatedObject(self, _cmd);}@end

推荐阅读：

http://www.saturngod.net/articles/uinavigationbar-background-color/

http://blog.sina.com.cn/s/blog_6291e42d0101f6b0.html