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Question

我正在尝试保存已转换（旋转，缩放和移动）UIImageView并将转换加载回屏幕，但它根本不起作用。每次我尝试，UIImageView都应该在不同的地方。

这里有一些代码：

保存到UserDefaults：

NSUserDefaults * UserDefs = [NSUserDefaults standardUserDefaults];
UIImageView * petit = (UIImageView*)[ConView viewWithTag:1];
[UserDefs setBool:YES forKey:@"gespeichert"];
[UserDefs setObject:NSStringFromCGRect([petit frame]) forKey:@"frame"];
[UserDefs setObject:NSStringFromCGAffineTransform(petit.transform) forKey:@"position1"];
[UserDefs synchronize];

从UserDefaults加载：

CGAffineTransform transformation = CGAffineTransformFromString([UserDefs objectForKey:@"position1"]);
    su.transform = transformation; // "su" is an UIImageView - allocated with Frame from:
    CGRect RectFrame = CGRectFromString([UserDefs objectForKey:@"frame"]);

我错了什么？也许有人可以帮助我。

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编辑：我现在改了代码：用于加载

CGRect frameGroesse;
    frameGroesse = CGRectFromString([UserDefs objectForKey:@"frame"]);
    UIImageView * su = [[UIImageView alloc] initWithFrame:frameGroesse];
    su.image = [UIImage imageNamed:@"Xcode.jpg"];
    su.contentMode = UIViewContentModeScaleAspectFit;
    su.multipleTouchEnabled = YES;
    su.tag = 1;
    [su setUserInteractionEnabled:YES];
    [self addGestureRecognizersToPiece:su];
    CGAffineTransform transformation = CGAffineTransformFromString([UserDefs objectForKey:@"position1"]);
    su.transform = transformation;
    su.center = CGPointFromString([UserDefs objectForKey:@"center"]);

    [ConView addSubview:su];
    [ConView bringSubviewToFront:su];
    [ConView bringSubviewToFront:[ConView viewWithTag:1]];
    [su release];

保存：

NSUserDefaults * UserDefs = [NSUserDefaults standardUserDefaults];
UIImageView * petit = (UIImageView*)[ConView viewWithTag:1];
[UserDefs setBool:YES forKey:@"gespeichert"];
[UserDefs setObject:NSStringFromCGRect([petit bounds]) forKey:@"frame"];
[UserDefs setObject:NSStringFromCGPoint(petit.center) forKey:@"center"];

[UserDefs setObject:NSStringFromCGAffineTransform(petit.transform) forKey:@"position1"];
[UserDefs synchronize];

但是在加载图像后，我仍然会得到一个小动作。还是需要一些帮助。

Answer 1

CGAffineTransform可能会使您应用转换的视图的frame属性无效，因此您可能没有存储有用的帧...

Answer 2

您不应将transform，bounds和center与frame混合使用。例如，将transform设置为视图会影响其框架。至于你的UIImageView：它在superview中的位置应由其center定义。它的旋转/比例应由transform定义（为简单起见，不要将转换放在转换中）。大小应由bounds.size定义。所以，你必须存储三个项目。

转换为NSStringFromCGAffineTransform

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2 个答案: