Question

我需要在编号数组中的多个按钮上设置默认值。现在我正在使用if语句，但它太长了，并且必须有一个更好的方法可能有一个循环？

当前代码

    @interface HelpPage()

    @property (weak, nonatomic) IBOutlet UIButton *box0;
    @property (weak, nonatomic) IBOutlet UIButton *box1;
    @property (weak, nonatomic) IBOutlet UIButton *box2;
    @property (weak, nonatomic) IBOutlet UIButton *box3;
    @property (weak, nonatomic) IBOutlet UIButton *box4;
    @property (weak, nonatomic) IBOutlet UIButton *box5; 
    // I have over 120 buttons on this screen
    @end

    @implementation Help

    NSMutableArray *boxes = [NSMutableArray arrayWithArray:[defaults objectForKey:@"helpboxeschecked"];
    NSInteger i;

    for (i=0; i < boxes.count; i++) {
        NSString *box = boxes[i];

        if ([box isEqualToString:@"0"]) {
            [_box0 setImage:[UIImage imageNamed:@"checked.png"] forState: UIControlStateNormal];
        }
        if ([box isEqualToString:@"1"]) {
            [_box1 setImage:[UIImage imageNamed:@"checked.png"] forState: UIControlStateNormal];
        }
        if ([box isEqualToString:@"2"]) {
            [_box2 setImage:[UIImage imageNamed:@"checked.png"] forState: UIControlStateNormal];
        }
        // and so on for all boxes
    }

   // **Isn't there a way to have it be** 

    for (i=0; i < boxes.count; i++) {

        if ([box[i] = i) {
            [_box[i] setImage:[UIIMage imageNamed:@"checked.png"] forState: UIControlStateNormal];
        }

   }

Answer 1

您可以将按钮添加到IBOutletCollection并在按钮上设置tags，然后执行以下操作：

...
for (UIButton *button in myButtonCollection) {
   if (button.tag == box.intValue) {
       // set image
   }
}

或者只是将它们添加到数组中：

NSArray *buttons = @[_box1, _box2 ...

对于具有UIButton名称的循环

1 个答案: