在iOS7以上，个人感觉UIBarButtonItem在NavigationBar上太靠左和太靠右
如图，想在两个箭头之处，间隔屏幕的间距更大一些，所以分享出来自定义UIBarButtonItem

Snip20160330_1.png

首先创建一个UIBarButtonItem的category

//继承的UIButton 改变间距
@interface GSBarButton : UIButton
@end

@interface UIBarButtonItem (HSBarButton)
+ (instancetype)backBarButtonItemWithTarget:(id)target action:(SEL)action;//自定义的后退键  左边键
+ (instancetype)cancelBarButtonItemWithTarget:(id)target action:(SEL)action;//取消按钮  左边的
//还可以定义一些其他的需要的方法

//两个基础的创建UIBarButtonItem方法
- (instancetype)initWithTitle:(NSString *)title target:(id)target action:(SEL)action;
- (instancetype)initWithImage:(UIImage *)image highlightedImage:(UIImage *)highlightedImage target:(id)target action:(SEL)action;
@end

.m文件

@implementation HSBarButton
//改变间距
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    CGRect bounds = self.bounds;
    CGFloat widthDelta = MAX(44.0 - bounds.size.width, 0);
    CGFloat heightDelta = MAX(44.0 - bounds.size.height, 0);
    bounds = CGRectInset(bounds, -0.5 * widthDelta, -0.5 * heightDelta);
    return CGRectContainsPoint(bounds, point);
}
@end

@implementation UIBarButtonItem (HSBarButton)
+ (instancetype)backBarButtonItemWithTarget:(id)target action:(SEL)action
{
    return [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:KLeftBarButtonImage] style:UIBarButtonItemStylePlain target:target action:action];
}

+ (instancetype)cancelBarButtonItemWithTarget:(id)target action:(SEL)action
{
    return [[self alloc] initWithTitle:@"取消" target:target action:action];
}

- (instancetype)initWithTitle:(NSString *)title target:(id)target action:(SEL)action
{
    HSBarButton *button = [[HSBarButton alloc] init];
    [button setTitle:title forState:UIControlStateNormal];
    [button setTitle:title forState:UIControlStateHighlighted];
    [button setTitleColor:kGSNavigationTitleColor forState:UIControlStateNormal];
    [button setTitleColor:kGSBaseHighlightedColor forState:UIControlStateHighlighted];
    [button setTitleColor:[kGSNavigationTitleColor colorWithAlphaComponent:0.5] forState:UIControlStateDisabled];
    button.titleLabel.font = [UIFont boldSystemFontOfSize:16.0f];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    
    [button sizeToFit];
    
    self = [self initWithCustomView:button];
    if (self)
    {

    }
    return self;
}

- (instancetype)initWithImage:(UIImage *)image highlightedImage:(UIImage *)highlightedImage target:(id)target action:(SEL)action
{
    HSBarButton *button = [[HSBarButton alloc] init];
    [button setImage:image forState:UIControlStateNormal];
    [button setImage:highlightedImage forState:UIControlStateHighlighted];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    
    [button sizeToFit];
    
    self = [self initWithCustomView:button];
    if (self)
    {
        
    }
    return self;
}
@end

这样 就搞定，有什么不对的地方 望请指教，一起学习