方案一：利用UINavigationBar 自帶的布局item（Fixed space Bar Button Item）來適配ios7. 其實就是在原來返回按鈕的位置上在多加一個占位的Item

為UINavigationBar 寫一個分類。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

在要設置返回按鈕的UIViewController中按照如下使用。

 

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

creatBarItemWithAction是我自己寫的一個方法。

 

 

/**

* 退出視圖。

*/

-(void)dismiss

{

[selfdismissViewControllerAnimated:YEScompletion:nil];

}

 

/**

* 創建一個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：在創建自定義UIBarButtonItem的時候通過設置自定義view的圖片偏移屬性來做適配。

 

在要設置返回按鈕的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;

}