Question

我有2个UIScrollView：

- (void)generateHeadView {

    self.headArray = [[NSArray alloc]initWithArray:self.headButtonArray];

    for (int i = 0; i < [self.headArray count]; i++) {

        UIButton *button0 = [[UIButton alloc]init];
        button0 = [self.headArray objectAtIndex:i];
        CGRect frame = CGRectMake(0, (self.playerScrollView.frame.size.height*i)+((self.playerScrollView.frame.size.height/2)-button0.frame.size.height/2), button0.frame.size.width, button0.frame.size.height);

        button0.frame = frame;

        [playerScrollView addSubview:button0];

    }

    playerScrollView.contentSize = CGSizeMake(self.playerScrollView.frame.size.width , self.playerScrollView.frame.size.height * [self.headArray count]);

}

和

- (void)generateEnemyHeadView {

    self.headArray = [[NSArray alloc]initWithArray:self.headButtonArray];


    for (int i = 0; i < [self.headArray count]; i++) {

        UIButton *button1 = [[UIButton alloc]init];
        button1 = [self.headArray objectAtIndex:i];
        CGRect frame = CGRectMake(0, (self.enemyScrollView.frame.size.height*i)+((self.enemyScrollView.frame.size.height/2)-button1.frame.size.height/2), button1.frame.size.width, button1.frame.size.height);

        button1.frame = frame;

        [enemyScrollView addSubview:button1];

    }
    enemyScrollView.contentSize = CGSizeMake(self.enemyScrollView.frame.size.width , self.enemyScrollView.frame.size.height * [self.headArray count]);

}

如果我删除[enemyScrollView addSubview:button1];然后1 UIScrollView显示按钮但是当我添加[enemyScrollView addSubview:button1];时，只有2个UIScrollView显示按钮......

任何想法？

抱歉我的英文

Answer 1

此代码存在很多 OOP概念的问题。

首先，我们从问题开始：

您有一个 UIButton数组。 UIButton，可以添加到类 UIView（或类似）上。因此，此按钮，只能 1 SUPERVIEW 。

换句话说，如果你在view1上添加按钮，你会在view1上看到它; 但如果在view2上添加此按钮后，您将在view2上看到它，而在view1中不会再看到它。

你能同时在两个地方吗？

其他事情..更好的代码可能是这样的：

- (void)generateHeadView {

    self.headArray = [self.headButtonArray copy]; 
    //if self.headButtonArray is mutable use copy otherwise no.

    for (int i = 0; i < [self.headArray count]; i++) {

        @autorelease {
            UIButton *button0 = [self.headArray objectAtIndex:i];

            button0.frame = CGRectMake(0, (self.playerScrollView.frame.size.height*i)+((self.playerScrollView.frame.size.height/2)-button0.frame.size.height/2), button0.frame.size.width, button0.frame.size.height);

            [playerScrollView addSubview:button0];
        }
    }

    playerScrollView.contentSize = CGSizeMake(self.playerScrollView.frame.size.width , self.playerScrollView.frame.size.height * [self.headArray count]);

}

对于另一个是相同的。显然，你需要有另一组按钮，这样你才能在headButtonArray中使用相同的按钮..但是你需要另一组按钮......或者改变策略。

两个UIScrollView一个不显示内容

1 个答案: