IOS:在 ScrollView 中添加一些子 ScrollView ，图像不出现

Question

我有这个代码:

- (void)viewDidLoad
{ 
[super viewDidLoad];

NSArray *image = [NSArray arrayWithObjects:[UIImage imageNamed:@"1.png"], [UIImage imageNamed:@"2.png"], [UIImage imageNamed:@"3.png"], nil];

for (int i = 0; i < image.count; i++) {
    CGRect frame;
    frame.origin.x = scrollV.frame.size.width * i;
    frame.origin.y = 0;
    frame.size = scrollV.frame.size;

    UIScrollView *subScrollView = [[UIScrollView alloc] initWithFrame:frame];
    UIImageView *subview = [[UIImageView alloc] initWithFrame:frame];

    [subview setImage:[image objectAtIndex:i]];
    [subScrollView addSubview:subview];
    [scrollV addSubview:subScrollView];
    [subview release];
    [subScrollView release];
}

scrollV.contentSize = CGSizeMake(scrollV.frame.size.width * image.count, scrollV.frame.size.height);

}

scrollV 是主 ScrollView ，它具有“启用分页”如果我使用这段代码，我的 scrollV 启用了分页，但我在第一页只看到它里面的“1.png”，我没有看到其他 png，为什么？

Answer 1

您将 subview 的框架设置为不正确的值。这使它与其 subScrollView 成为相同的框架，因此它将它推到右边。试试这个:

- (void)viewDidLoad
{ 
[super viewDidLoad];

NSArray *image = [NSArray arrayWithObjects:[UIImage imageNamed:@"1.png"], [UIImage imageNamed:@"2.png"], [UIImage imageNamed:@"3.png"], nil];

for (int i = 0; i < image.count; i++) {
    CGRect frame;
    frame.origin.x = scrollV.frame.size.width * i;
    frame.origin.y = 0;
    frame.size = scrollV.frame.size;

    UIScrollView *subScrollView = [[UIScrollView alloc] initWithFrame:frame];
    UIImageView *subview = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, frame.size.width, frame.size.height)];

    UIImage *image = [image objectAtIndex:i];
    subScrollView.contentSize = image.size;

    [subview setImage:image];
    [subScrollView addSubview:subview];
    [scrollV addSubview:subScrollView];
    [subview release];
    [subScrollView release];
}

scrollV.contentSize = CGSizeMake(scrollV.frame.size.width * image.count, scrollV.frame.size.height);

}

编辑:也可能最好设置内部 ScrollView 的内容大小。我在上面添加了代码。