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标题: ios - 使用 subview 取消归档 UIImageView [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 11:42
标题: ios - 使用 subview 取消归档 UIImageView

我有点疯狂地尝试归档和取消归档一个 UIImageView，它有许多 subview ，这些 subview 是从 UIImageView 派生的自定义 View 。这是我所做的:

为项目添加一个类别以允许 UIImage 不符合 NSCoding 的事实:

#import "UIImage-NSCoding.h"
#define kEncodingKey @"UIImage"

@implementation UIImage(NSCoding)

- (id)initWithCoderNSCoder *)decoder
{
    if ((self = [super init]))
    {
        NSData *data = [decoder decodeObjectForKey:kEncodingKey];
        self = [self initWithData:data];
    }        
    return self;
}

- (void)encodeWithCoderNSCoder *)encoder
{
    NSData *data = UIImagePNGRepresentation(self);
    [encoder encodeObject:data forKey:kEncodingKey];
}

@end

我正在归档的 UIImageView 是我的主视图 Controller 的一个属性，称为“背景”。我这样保存:

NSData *dataToSave = [NSKeyedArchiver archivedDataWithRootObject:self.background];
[dataToSave dataWithContentsOfFile:imagePath options:NSDataWritingAtomic error:nil];

然后我像这样解压它:

NSData *savedData = [NSData dataWithContentsOfFile:imagePath];    
UIImageView *restoredImageView = [NSKeyedUnarchiver unarchiveObjectWithData:savedData];
self.background.image = restoredImageView.image; // this works - archived image is displayed

现在我想让我的 subview (或至少其中一个!)与未归档的根对象一起显示:

NSLog(@"Subviews: %d", [restoredImageView.subviews count]); // this tells me my subviews have been archived along with the root object
NSLog(@"Subview 0: %@", [restoredImageView.subviews objectAtIndex:0]); // and they exist as expected

NSLog(@"Subviews: %d", [self.background.subviews count]); // at this point no subviews are present
[self.background addSubview:[restoredImageView.subviews objectAtIndex:0]]; // subview is not visible on screen
NSLog(@"Subviews: %d", [self.background.subviews count]); // count is one, but where is it?

ORUImageView *oru = [[ORUImageView alloc] init]; // I try creating the subview myself
oru = [self.background.subviews objectAtIndex:0]; 
[self.background addSubviewru]; // it still doesn't show on screen
[self.background bringSubviewToFrontru]; // makes no difference

NSLog(@"String: %@", oru.testString); // this correctly logs the test string I added to my custom class

这是我添加到我的 ORUImageView 子类的内容:

- (void)encodeWithCoderNSCoder *)aCoder
{
    [super encodeWithCoder:aCoder];    
    [aCoder encodeObject:self.testString forKey"theString"];
    [aCoder encodeObject:self.image forKey"theImage"]; // not sure if this is needed
}


- (id)initWithCoderNSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    [self setTestString:[aDecoder decodeObjectForKey"theString"]];
    [self setImage:[aDecoder decodeObjectForKey"theImage"]]; // not sure if this is needed
    return self;
}

我已经尝试过使用和不使用 image 属性的编码。

我怀疑问题与此属性有关，因为我清楚地将 subview 添加到未归档 View 中 - 它只是不可见!我觉得图像属性没有被设置，但我自己找不到设置它的方法，也找不到任何告诉我正确方法的东西。

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Best Answer-推荐答案

嗯。我刚试过这个:

- (IBAction)doButton1id)sender {
    theData = [NSKeyedArchiver archivedDataWithRootObject:iv];
    [iv removeFromSuperview];
    iv = nil;
}

- (IBAction)doButton2id)sender {
    iv = [NSKeyedUnarchiver unarchiveObjectWithData:theData];
    [self.view addSubview:iv];
}

它工作 - 与一个普通的 UIImageView。所以现在我想我不明白你在说什么；似乎 UIImageView is 已经与其图像一起存档。因此，您必须尝试解决其他问题。但我不明白问题出在哪里。

关于ios - 使用 subview 取消归档 UIImageView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9334453/

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