Question

我有点疯狂尝试归档和取消归档UIImageView，它有许多子视图，这些子视图是从UIImageView派生的自定义视图。这就是我所做的：

为项目添加一个类别，以允许UIImage不符合NSCoding：

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

@implementation UIImage(NSCoding)

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

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

@end

我正在归档的UIImageView是我的主视图控制器的属性，称为“背景”。我这样保存：

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

然后我将它取消归档：

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

现在我想让我的子视图（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NSLog(@"Subviews: %d", [restoredImageView.subviews count]); // this tells me my subviews have been archived along with the root object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 addSubview:oru]; // it still doesn't show on screen
[self.background bringSubviewToFront:oru]; // 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子类中的内容：

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


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

我已尝试使用和不使用image属性的编码。

我怀疑这个问题与这个属性有关，因为我显然已将子视图添加到未归档的视图中 - 它只是不可见！我觉得图像属性没有设置，但我找不到自己设置的方法，我找不到任何告诉我正确方法的东西。

Answer 1

[先前的答案已删除。]

编辑：嗯。我刚试过这个：

- (IBAction)doButton1:(id)sender {
    theData = [NSKeyedArchiver archivedDataWithRootObject:iv];
    [iv removeFromSuperview];
    iv = nil;
}

- (IBAction)doButton2:(id)sender {
    iv = [NSKeyedUnarchiver unarchiveObjectWithData:theData];
    [self.view addSubview:iv];
}

它工作 - 使用普通的UIImageView。所以现在我想我不明白你的意思;看来UIImageView 已经存档了它的图像。所以你必须尝试解决其他一些问题。但我不是在理解问题所在。

使用子视图取消归档UIImageView

1 个答案: