iPhone：带有多个 UIImageView 的 UIScrollview，具有放大/缩小效果

Question

我的应用程序中有一个 UIscrollview，其中包含多个 UIimageview。我想应用捏放大/缩小功能。将 UIImageview 添加到 UIScrollView 的代码如下，

self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor];
    [scViewObject setCanCancelContentTouches:NO];
    scViewObject.indicatorStyle = UIScrollViewIndicatorStyleWhite;
    scViewObject.clipsToBounds = NO;        // default is NO, we want to restrict drawing within our scrollview
    scViewObject.scrollEnabled = YES;
    scViewObject.alwaysBounceHorizontal=YES;
    scViewObject.pagingEnabled = YES;

    UIView *view = nil;
    NSArray *subviews = [scViewObject subviews];
    for (view in subviews)
    {
        [view removeFromSuperview];
    }
    int left=20;
    numberOfViewController=[ListOfImages count];
    //NSMutableArray *controllers = [[NSMutableArray alloc] init];
    for (unsigned ii = 0; ii < numberOfViewController; ii++)
    {
        UIImageView *temp=[[UIImageView alloc] init];
        temp.contentMode=UIViewContentModeScaleAspectFit;
        temp.userInteractionEnabled = YES;
        temp.multipleTouchEnabled  = YES;
        temp.clipsToBounds = YES;
        temp.image=[ListOfImages objectAtIndex:ii];
        temp.frame=CGRectMake(left, 0, 280, 365);
        temp.tag=ii;

        [scViewObject addSubview:temp];
        left=left+320;
    }

    [scViewObject setContentSize:CGSizeMake((numberOfViewController * kScrollObjWidth), 365)];

scViewObject 是 UIscrollview。请建议我如何添加放大/缩小功能

Answer 1

您需要观看几个 ADC 视频：

WWDC 2010：使用滚动视图设计应用程序

WWDC 2011：高级滚动视图技术，

但基本上您需要在外部滚动视图的每个“页面”内实现缩放滚动视图并将每个图像添加到每个缩放滚动视图中。

另请参阅文档
和示例代码