只需要写一个 UIBarButtonItem类的扩展 其实原理很简单

扩展类创建就不在描述了 下面只贴上方法的使用

扩展类.h

+ (instancetype)itemWithNorImage:(NSString *)image highImage:(NSString *)highImage target:(id)target action:(SEL)action andFrame:(CGRect)rect;

扩展类.m 

+ (instancetype)itemWithNorImage:(NSString *)image highImage:(NSString *)highImage target:(id)target action:(SEL)action andFrame:(CGRect)rect

{

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

[btn setImage:[UIImage imageNamed:image] forState:UIControlStateNormal];

[btn setImage:[UIImage imageNamed:highImage] forState:UIControlStateHighlighted];

btn.frame = rect;

[btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

UIView *containVew = [[UIView alloc] initWithFrame:btn.bounds];

[containVew addSubview:btn];

return [[UIBarButtonItem alloc]initWithCustomView:containVew];

}

其实原理就是将这个Button 放在一个View上  再把这个View 放在UIBarButtonItem上，

而以前则是直接将Button放在Item上  会出现一些图片变形问题。

使用

单一左，或者右

UIBarButtonItem *item1 = [UIBarButtonItem itemWithNorImage:@"123.png" highImage:nil target:self action:@selector(gogo) andFrame:CGRectMake(0,0,40,40)];

[self.navigationItem setLeftBarButtonItem:item1];

多个item

NSArray *arr = [item1,item2];

[self.navigationItem setLeftBarButtonItems:arr];