自定义NavgationBar返回按钮

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iOS 上UINavigationController视图压栈形式，可以在当前视图无限制push许多视图，然而一些会觉得自带的push按钮不够美观，而且当上的上一个页面title很长的时候，那个返回按钮就很长,怎样定义一个自己返回按钮呢？像第三幅图片一样。。。

需要push的视图里面定义一个事件

- (IBAction)pushVC:(id)sender {    NavViewController *navVC = (NavViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"NavViewController"];    navVC.title = NSLocalizedString(@"设置", nil);    [self.navigationController pushViewController:navVC animated:YES];}

替换返回按钮，定义自定义按钮

- (void)viewDidLoad{    [super viewDidLoad];        UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];    backBtn.frame = CGRectMake(0, 0, 44, 44);        [backBtn setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];    [backBtn addTarget:self action:@selector(doBack:) forControlEvents:UIControlEventTouchUpInside];        UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backBtn];    self.navigationItem.leftBarButtonItem = backItem;     // Do any additional setup after loading the view.}-(void)doBack:(id)sender{    [self.navigationController popViewControllerAnimated:YES];}

源码下载地址:https://github.com/XFZLDXF/XFNavBarBtn

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