ios7 自定义UINavigationBar UIBarButtonItem 10px的偏移纠正的两种解决方案

方案一：利用UINavigationBar 自带的布局item（Fixed space Bar Button Item）来适配ios7. 其实就是在原来返回按钮的位置上在多加一个占位的Item

    为UINavigationBar 写一个分类。UINavigationItem+correct_offset.h

    #import

    @interface UINavigationItem (correct_offset)

    - (void)addLeftBarButtonItem:(UIBarButtonItem *)leftBarButtonItem;

    - (void)addRightBarButtonItem:(UIBarButtonItem *)rightBarButtonItem;

    @end

    #import UINavigationItem+correct_offset.h

    #define ios7 ([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0?YES:NO)

    @implementation UINavigationItem (correct_offset)

    - (void)addLeftBarButtonItem:(UIBarButtonItem *)leftBarButtonItem

    {

    if (ios7) {

    // Add a spacer on when running lower than iOS 7.0

    UIBarButtonItem *negativeSpacer = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

    target:nil action:nil];

    negativeSpacer.width = -20;

    [self setLeftBarButtonItems:[NSArrayarrayWithObjects:negativeSpacer, leftBarButtonItem,nil]];

    } else {

    // Just set the UIBarButtonItem as you would normally

    [self setLeftBarButtonItem:leftBarButtonItem];

    }

    }

    - (void)addRightBarButtonItem:(UIBarButtonItem *)rightBarButtonItem

    {

    if (ios7) {

    // Add a spacer on when running lower than iOS 7.0

    UIBarButtonItem *negativeSpacer = [[UIBarButtonItemalloc]

    initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

    target:nilaction:nil];

    negativeSpacer.width = 10;

    [self setRightBarButtonItems:[NSArrayarrayWithObjects:negativeSpacer, rightBarButtonItem,nil]];

    } else {

    // Just set the UIBarButtonItem as you would normally

    [self setRightBarButtonItem:rightBarButtonItem];

    }

    }

    @end

    在要设置返回按钮的UIViewController中按照如下使用。

    [self.navigationItemaddLeftBarButtonItem:[self creatBarItemWithAction:@selector(dismiss)]];

    creatBarItemWithAction是我自己写的一个方法。

    /**

    * 退出视图。

    */

    -(void)dismiss

    {

    [selfdismissViewControllerAnimated:YEScompletion:nil];

    }

    /**

    * 创建一个UIBarButtonItem

    *

    * @param _action action

    *

    * @return UIBarButtonItem

    */

    -(UIBarButtonItem*)creatBarItemWithAction:(SEL)_action{

    UIButton* button = [UIButtonbuttonWithType:UIButtonTypeCustom];

    [button setImage:[UIImageimageNamed:@backButton.png]forState:UIControlStateNormal];

    [button setFrame.:CGRectMake(0,0,40, 40)];

    [button addTarget:selfaction:_action forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem* item = [[UIBarButtonItemalloc] initWithCustomView:button] ;

    return item;

    }

方式二：在创建自定义UIBarButtonItem的时候通过设置自定义view的图片偏移属性来做适配。

    在要设置返回按钮的UIViewController中按照如下使用。

    self.navigationItem.leftBarButtonItem = [selfcreatBarItemWithAction:@selector(dismiss)solutiontwo:2];

    -(UIBarButtonItem*)creatBarItemWithAction:(SEL)_action solutiontwo:(NSInteger)index{

    UIButton* button = [UIButtonbuttonWithType:UIButtonTypeCustom];

    [button setImage:[UIImageimageNamed:@backButton.png]forState:UIControlStateNormal];

    [button setFrame.:CGRectMake(0,0,40, 40)];

    if (ios7) {

    [button setImageEdgeInsets:UIEdgeInsetsMake(0, -30,0, 0)];

    }

    else

    {

    [button setImageEdgeInsets:UIEdgeInsetsMake(0,0, 0,0)];

    }

    [button addTarget:selfaction:_action forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem* item = [[UIBarButtonItemalloc] initWithCustomView:button] ;

    return item;

    }