Question

我想在ipad应用程序中自动放大并缩小图像。例如，在启动画面中，它应该将图像显示为原始大小，一段时间后它应该自动开始缩小。这将为其提供动画放大/缩小外观。

我们如何在iPad中使用UIImageView做到这一点？

提前谢谢。

ScrollImageController.h

@interface ScrollImageViewController : UIViewController {

} @end

ScrollImageController.m
- (void)viewDidLoad {



[super viewDidLoad];
UIScrollView *scrollView = [[UIScrollView alloc]   initWithFrame:self.view.frame];
scrollView.contentSize = CGSizeMake(847, 800);
UIImage *image = [UIImage imageNamed:@"just.jpg"];
UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
[image release];
[scrollView addSubview:imageView];
[imageView release];
[self.view addSubview:scrollView];


[scrollView setZoomScale:2.0 animated: YES];
[scrollView release];


}

[super viewDidLoad]; UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame]; scrollView.contentSize = CGSizeMake(847, 800); UIImage *image = [UIImage imageNamed:@"just.jpg"]; UIImageView *imageView = [[UIImageView alloc] initWithImage: image]; [image release]; [scrollView addSubview:imageView]; [imageView release]; [self.view addSubview:scrollView]; [scrollView setZoomScale:2.0 animated: YES]; [scrollView release];

Answer 1

您应该将UIImageView作为UIScrollView的子视图

然后使用UIScrollViewDelegate创建类，然后使用以下方法。

    [MyScrollView setZoomScale:(float)scale animated:YES];

编辑：我认为你不需要实现UIScrollViewDelegate协议

如何在iPad中放大/缩小图像？

1 个答案: