转载自：http://www.cnblogs.com/maxfong/p/3375167.html

iOS7之前的UI为：

而在iOS7中，由于设计方面的原因，使得UI变为:

修改的方法重写UINavigationItem的setLeftBarButtonItem和setRightBarButtonItem方法，使之与之前版本兼容；

代码如下：

@interface UINavigationItem (margin)

@end

@implementation UINavigationItem (margin)

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1

- (void)setLeftBarButtonItem:(UIBarButtonItem *)_leftBarButtonItem

{

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)

    {

        UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];

        negativeSeperator.width = -12;
if (_leftBarButtonItem)

        {

            [self setLeftBarButtonItems:@[negativeSeperator, _leftBarButtonItem]];

        }

        else

        {

            [self setLeftBarButtonItems:@[negativeSeperator]];

        }

        [negativeSeperator release];

    }

    else

    {

        [self setLeftBarButtonItem:_leftBarButtonItem animated:NO];

    }

}
- (void)setRightBarButtonItem:(UIBarButtonItem *)_rightBarButtonItem

{

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)

    {

        UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];

        negativeSeperator.width = -12;
if (_rightBarButtonItem)

        {

            [self setRightBarButtonItems:@[negativeSeperator, _rightBarButtonItem]];

        }

        else

        {

            [self setRightBarButtonItems:@[negativeSeperator]];

        }

        [negativeSeperator release];

    }

    else

    {

        [self setRightBarButtonItem:_rightBarButtonItem animated:NO];

    }

}
#endif

@end

项目源码不做任何修改，问题解决；

添加Button：

UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:btnBack];

self.navigationItem.leftBarButtonItem = leftBarItem;

[leftBarItem release];

iOS7 UI兼容 导航栏按钮边距,布布扣,bubuko.com