2019/01/09 17:02

在父视图中批改

1、应用 backBarButtonItem 实现，返回按钮紧贴屏幕右边，有返回手势。

这种办法须要将图片设置成 UIImageRenderingModeAlwaysOriginal 模式能力正确显示，否则图片会被渲染成蓝色。

- (void)viewDidLoad {    [super viewDidLoad];    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];    self.navigationController.navigationBar.backIndicatorImage = [[UIImage imageNamed:@"btn_back_black"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    self.navigationController.navigationBar.backIndicatorTransitionMaskImage = [[UIImage imageNamed:@"btn_back_black"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    self.navigationItem.backBarButtonItem = backItem;}

2、应用 leftBarButtonItem 实现，返回按钮与屏幕左边缘有一小段距离（大略为8），有返回手势。

#import "BaseViewController.h"@interface BaseViewController ()@property (nonatomic, strong) UIBarButtonItem *backButtonItem;@end@implementation BaseViewController- (void)viewDidLoad {    [super viewDidLoad];    self.navigationItem.hidesBackButton = YES;    if (self.navigationController.viewControllers.count > 1) {        [self backButtonItemImageNamed:@"btn_back_black" target:self action:@selector(backButtonItemClicked:)];    }}- (void)viewDidAppear:(BOOL)animated {    [super viewDidAppear:animated];    //解决根试图右边滑动手势页面卡死问题    if (self.navigationController.viewControllers.count == 1) {        self.navigationController.interactivePopGestureRecognizer.enabled = NO;    } else {        self.navigationController.interactivePopGestureRecognizer.enabled = YES;    }}- (void)backButtonItemImageNamed:(NSString*)imgName target:(id)target action:(SEL)selector {    UIImage* backImg = [[UIImage imageNamed:imgName] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    UIBarButtonItem* item = [[UIBarButtonItem alloc] initWithImage:backImg style:UIBarButtonItemStylePlain target:target action:selector];    self.backButtonItem = item;    self.navigationItem.leftBarButtonItem = self.backButtonItem;    //启用返回手势，须要解决卡死问题    self.navigationController.interactivePopGestureRecognizer.delegate = nil;}- (void)backButtonItemClicked:(UIButton *)sender {    [self.navigationController popViewControllerAnimated:YES];}@end

在本视图中批改

1、批改成只有图片的：

UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"箭头left40x40"] style:UIBarButtonItemStylePlain target:self action:@selector(back)];self.navigationItem.leftBarButtonItem = backItem;

2、批改成只有文字的

UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:self action:@selector(back)];self.navigationItem.leftBarButtonItem = backItem;

3、自定义文字和图片的：

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];backButton.frame = CGRectMake(0, 0, 30, 30);[backButton setTitle:@"返回" forState:UIControlStateNormal];[backButton setImage:[[UIImage imageNamed:@"箭头left40x40"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forState:UIControlStateNormal][backButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

留神：下面这3种办法都会使返回按钮偏右，不大好看；而且会使零碎自带的右滑手势返回移除管制的性能生效，解决办法就是在前面增加一句代码，让导航控制器从新设置这个性能，解决代码如下：

self.navigationController.interactivePopGestureRecognizer.delegate = nil;

以上这些办法都是只是在一个视图中失效

全局设置返回按钮

大多数时候自定义返回按钮都是全局一样的，所以全局设置的办法请参考：
iOS 自定义 NavigationController