关于iOS导航栏返回按钮问题的解决方法

这样可以改变返回按钮的点击事件，此时想要解决点击范围只能在这个view上添加一个指定大小的按钮了。最后总结出来的解决办法就是创建一个viewController的分类:

UIViewController+CustomBackButton.h文件

#import <UIKit/UIKit.h>

@interface UIViewController (CustomBackButton)

- (void)customNavBackButtonMethod;

@end

UIViewController+CustomBackButton.m文件

#import "UIViewController+CustomBackButton.h"
#import <objc/runtime.h>

@implementation UIViewController (CustomBackButton)

+ (void)load {
 static dispatch_once_t onceToken;
 dispatch_once(&onceToken, ^{
  Class class = [self class];
  
  SEL originalSelector = @selector(viewDidLoad);
  SEL swizzledSelector = @selector(mm_viewDidLoad);
  
  SEL originalSelector1 = @selector(viewDidAppear:);
  SEL swizzledSelector1 = @selector(mm_viewDidAppear);
  
  Method originalMethod = class_getInstanceMethod(class, originalSelector);
  Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
  
  Method originalMethod1 = class_getInstanceMethod(class, originalSelector1);
  Method swizzledMethod1 = class_getInstanceMethod(class, swizzledSelector1);
  
  BOOL didAddMethod = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
  BOOL didAddMethod1 = class_addMethod(class, originalSelector1, method_getImplementation(swizzledMethod1), method_getTypeEncoding(swizzledMethod1));

  if (didAddMethod) {
   class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
  } else {
   method_exchangeImplementations(originalMethod, swizzledMethod);
  }
  
  if (didAddMethod1) {
   class_replaceMethod(class, swizzledSelector1, method_getImplementation(originalMethod1), method_getTypeEncoding(originalMethod1));
  } else {
   method_exchangeImplementations(originalMethod1, swizzledMethod1);
  }
 });
}

#pragma mark - Method Swizzling

- (void)mm_viewDidLoad {
 [self mm_viewDidLoad];
 UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
 [self.navigationItem setBackBarButtonItem:backButtonItem];
}

- (void)mm_viewDidAppear {
 [self mm_viewDidAppear];
 UIView *nav_back = [self.navigationController.navigationBar.subviews objectAtIndex:2];
 if ([nav_back isKindOfClass:NSClassFromString(@"UINavigationItemButtonView")]) {
  nav_back.userInteractionEnabled = YES;
  // UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backAction:)];
  // [nav_back addGestureRecognizer:tap];
  UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
  backButton.frame = CGRectMake(0, 0, 20, 21);
  [backButton addTarget:self action:@selector(customNavBackButtonMethod) forControlEvents:UIControlEventTouchUpInside];
  [nav_back addSubview:backButton];
 }
}


- (void)customNavBackButtonMethod {
 [self.navigationController popViewControllerAnimated:YES];
}

@end

								 
 3/4   首页 上一页 1 2 3 4 下一页 尾页