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[操作系统]APP评价(星星点赞)很简单


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