为UIButtonBarItem创建分类

#import "UIBarButtonItem+Extension.h"

@implementation UIBarButtonItem (Extension)

+(UIBarButtonItem *)itemWithImageName:(NSString *)ImageName highImageName:(NSString *)highImageName target:(id)target action:(SEL)action{

UIButton *btn=[[UIButton alloc] init];

[btn setBackgroundImage:[UIImage imageNamed:ImageName] forState:UIControlStateNormal];

[btn setBackgroundImage:[UIImage imageNamed:highImageName] forState:UIControlStateHighlighted];

btn.frame=CGRectMake(0, 0, btn.currentBackgroundImage.size.width, btn.currentBackgroundImage.size.height);

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

return [[UIBarButtonItem alloc]initWithCustomView:btn];

}

@end