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;

}