1.用代码或者storyboard创建5个button（现在一般都是5个星星）

我用的是storyboard

记得一定要设置button的tag值

在.h中

@property (weak, nonatomic) IBOutlet UIButton *btn5;

- (IBAction)btn:(id)sender;

@property (weak, nonatomic) IBOutlet UIButton *btn4;

@property (weak, nonatomic) IBOutlet UIButton *btn3;

@property (weak, nonatomic) IBOutlet UIButton *btn2;

@property (weak, nonatomic) IBOutlet UIButton *btn1;

然后在.m中

@interface ViewController ()

{

NSArray * starArray;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

starArray = [NSArray arrayWithObjects:_btn1,_btn2,_btn3,_btn4,_btn5, nil];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (IBAction)btn:(id)sender

{

UIButton * allBtn =sender;

for (UIButton *button in starArray)

{

if (button.tag <= allBtn.tag)

{

[button setBackgroundImage:[UIImage imageNamed:@"goldstar1"] forState:UIControlStateNormal];

//  goldstar1 和 greystar2 图片名称

}

else

{

[button setBackgroundImage:[UIImage imageNamed:@"greystar2"] forState:UIControlStateNormal];

}

}

}

这样就ok 了

效果如下