在 superview 中存储 UIImageViews 及其位置

Posted 2023-03-13

【中文标题】在 superview 中存储 UIImageViews 及其位置

【英文标题】：Storing UIImageViews and their locations in the superview

【发布时间】：2011-03-24 00:05:15

【问题描述】：

如何存储/序列化 UIImageView 以便在应用重新启动时加载它们？

我还想将它们的当前位置与每张图像一起存储在超级视图中。这是如何检测到的？

谢谢

【参考方案1】：

我通过创建一个单独的类（我称之为图像视图管理器）来保存图像视图属性，例如位置、图像名称等，然后将 UIImageView 子类化以引用图像视图的实例管理器并在图像视图中的某些内容（例如位置）发生更改时更新其属性。然后您只需序列化图像管理器，并在重新启动时根据每个管理器中的信息重新创建图像视图（尽管我使用了核心数据，因为这是更大的核心数据应用程序的一部分）。

经理类：

#import <CoreData/CoreData.h>


@interface ImageViewManager :  NSManagedObject  



@property (nonatomic, retain) NSNumber * imageLastY;
@property (nonatomic, retain) NSNumber * imageZorder;
@property (nonatomic, retain) NSNumber * imageLastX;
@property (nonatomic, retain) NSString * imageName;

@end

UIImageViewClass：

---- 接口-----

#import <UIKit/UIKit.h>
#import "ImageViewManager.h"

@protocol MyImageViewDelegate
-(void)didUpdateImageView:(UIImageView *)imageView;
@end

@interface MyImageView : UIImageView 

    ImageViewManager *imageViewManager;
    id <MyImageViewDelegate> delegate;

   
@property (nonatomic, retain) ImageViewManager *imageViewManager;
@property (nonatomic, assign) id <MyImageViewDelegate> delegate;
-(id)initWithImage:(UIImage *)image andImageViewManager:(ImageViewManager *)ivm;
@end

--- 实施 ---------

#import "MyImageView.h"


@implementation MyImageView
@synthesize imageViewManager;
@synthesize delegate;

- (id)initWithImage:(UIImage *)image andImageViewManager:(ImageViewManager *)ivm 

    if (self = [super initWithImage:image]) 
        self.userInteractionEnabled = YES;
        self.imageViewManager = ivm;
    

    return self;


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 

    UITouch *touch = [touches anyObject];
    [self.superview bringSubviewToFront:self];
    CGPoint prevlocation = [touch previousLocationInView:self.superview];
    CGPoint location = [touch locationInView:self.superview];

    location.x = (self.center.x - (prevlocation.x - location.x));
    location.y = (self.center.y - (prevlocation.y - location.y));
    self.center = location;
    self.imageViewManager.imageLastX = [NSNumber numberWithDouble:self.center.x];
    self.imageViewManager.imageLastY = [NSNumber numberWithDouble:self.center.y];

    

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
    [self.delegate didUpdateImageView:self];
   

- (void)dealloc 
    [imageViewManager release];
    [super dealloc];

【参考方案2】：

这可能比我原来的答案更好地回答你的问题：iPhone - save UIImageView state