带有图像的 UIScrollView

Posted 2023-03-16

【中文标题】带有图像的 UIScrollView

【英文标题】：UIScrollView with image

【发布时间】：2012-03-14 07:42:58

【问题描述】：

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

【参考方案1】：

用途：

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];

别忘了在你的 .h 文件中添加 UIScrollViewDelegate

注意：ARC 代码

【参考方案2】：

1.创建一个新项目 -> 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）

【参考方案3】：

如果它没有平移，则意味着您忘记设置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。见Panning and Zooming with UIScrollView

【参考方案4】：

@interface ZoomViewController : UIViewController <uiscrollviewdelegate> 

    IBOutlet UIScrollView *scroll;
    UIImageView *image;


@property (nonatomic, retain) UIScrollView *scroll;

@end
</uiscrollviewdelegate></uikit>

检查一下你的 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];

【讨论】：

谢谢，但我一直在此页面上收到错误消息：image =[[UIImage View alloc] initWithImage:[UIImage imageNamed:@"test.png"]];

不应该有空格：[UIImage View alloc] 应该说 [UIImageView alloc]