IOS 返回事件 UIBarButtonItem (一) 自定义backBarButtonItem

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/////// 与IOS7 以上滑动返回没有冲突

UIImage* image = [UIImage imageNamed:imageName];

UIBarButtonItem *item=[UIBarButtonItem appearance];

[item setBackButtonBackgroundImage:[image resizableImageWithCapInsets:UIEdgeInsetsMake(0, image.size.width, 0, 0)] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

[item setBackButtonTitlePositionAdjustment:UIOffsetMake(-400.f, 0) forBarMetrics:UIBarMetricsDefault];

self.navigationItem.backBarButtonItem = item;

/////// 一般返回键

UIButton *btnb = [UIButton buttonWithType : UIButtonTypeCustom];

btnb.frame = CGRectMake (0, 0, 44, 44);

// [btnb setBackgroundImage :[UIImage imageNamed:imageName] forState:UIControlStateNormal];

[btnb setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];

if ([UIImage imageNamed:[NSString stringWithFormat:@"%@h",imageName]]) {

[btnb setImage:[UIImage imageNamed:imageName] forState:UIControlStateHighlighted];

}

// btnb.showsTouchWhenHighlighted=YES;

[btnb addTarget:self action:@selector(showLeft:) forControlEvents:UIControlEventTouchUpInside];

if (ISIOS7LATER) {

btnb.imageEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);

}

UIBarButtonItem *ubar=[[UIBarButtonItem alloc] initWithCustomView :btnb];

self.navigationItem.backBarButtonItem = ubar;

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