UIScrollView with image

Question

是否可以使用UIScrollView查看大约800px长的图像？我尝试使用UIScrollView和UIImageView，但它没有滚动。有人能帮忙吗？

Answer 1

使用：

UIScrollView *yourScrollview = [[UIScrollView alloc] initWithFrame:(CGRect){{0,0}, {320,480}}];
UIImageView *yourImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourImageHere.png"]];
yourImageView.frame = yourScrollview.bounds;
yourScrollview.contentSize = yourImageView.frame.size;
yourScrollview.minimumZoomScale = 0.4;
yourScrollview.maximumZoomScale = 4.0;
[yourScrollview setZoomScale:yourScrollview.minimumZoomScale];
yourScrollview.delegate = self;
[self.view addSubview:yourScrollview];

不要忘记在.h文件中添加UIScrollViewDelegate

注：ARC代码

Answer 2

1。创建新项目->单视图应用程序
2.将以下代码放入：

"ViewController.m"

#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
-(void) viewDidLoad
{
    [super viewDidLoad];
    UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 
    [scrollView setContentSize:CGSizeMake(320, 800)];
    UIView * myView = [[UIView alloc] initWithFrame : CGRectMake(0, 0, 320, 800)]; 
    UIImageView * myImage = [[UIImageView alloc]initWithImage : [UIImage imageNamed:@"Test.png"]];
    [myView addSubview: myImage];
    [myImage release];
    [scrollView addSubview: myView];
    [myView release];
    [self.view addSubview: scrollView];
    [scrollView release];
}
- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}
@end

3.将图像"Test.png"放入您的项目中（拖放到Xcode->文件夹：支持文件）

Answer 3

如果没有平移，则表示您忘记设置contentSize属性。我的网站上有一个教程，展示了如何在UIScrollView中嵌入UIImageView，并将其设置为平移和缩放。它包括完整的可下载源代码。请参阅使用UIScrollView 进行平移和缩放

Answer 4

@interface ZoomViewController : UIViewController <uiscrollviewdelegate> {
    IBOutlet UIScrollView *scroll;
    UIImageView *image;
}
@property (nonatomic, retain) UIScrollView *scroll;
@end
</uiscrollviewdelegate></uikit>

一旦检查您的Viewdidload方法。

- (void)viewDidLoad {
       image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"img_body.png"]];
        [super viewDidLoad];
    image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"img_body.png"]];
    scroll.contentSize = image.frame.size;
    [scroll addSubview:image];
    scroll.minimumZoomScale = 0.4;
    scroll.maximumZoomScale = 4.0;
    scroll.delegate = self;
    [scroll setZoomScale:scroll.minimumZoomScale];
    [super viewDidLoad];
}