ios - UIImageView 的深层复制没有复制 iOS 中应用于原始 View 的所有委托(delegate)和手势

Question

这是我如何复制对象的复制代码

 - (id)copyWithZone:(NSZone *)zone {

    dragable *obj =[[[self class]allocWithZone:zone ] init];
    if (obj) {
        obj->startLocation=startLocation;
        obj->_firstX=_firstX;
        obj->_firstY=_firstY;
        obj->_lastRotation=_lastRotation;
        obj->_lastScale=_lastScale;
        obj.center=self.center;
        obj.frame=self.frame;
        obj.bounds=self.bounds;
        obj.backgroundColor = self.backgroundColor;
        obj.image=self.image;
    }
    return obj;
}

dragable 类是自定义的 uiimageView 类，上面应用了一些委托(delegate)和手势，这里有一些关于可拖动类的内部细节

@protocol draggableDelegate <NSObject>

@optional
-(void) currentObjectClicked:(UIImageView* )object;

@end

@interface dragable : UIImageView<NSCopying,UIGestureRecognizerDelegate>
{
    CGPoint startLocation;
    CGFloat _lastScale;
    CGFloat _lastRotation;
    CGFloat _firstX;
    CGFloat _firstY;
}
@property (nonatomic, assign) id<draggableDelegate> delegate;
@property (atomic,retain ) CAShapeLayer *marque;
@property (atomic,assign ) CGPoint startLocation;
@property (atomic,assign ) CGFloat _lastScale;
@property (atomic,assign ) CGFloat _lastRotation;
@property (atomic,assign ) CGFloat _firstX;
@property (atomic,assign ) CGFloat _firstY;



@end

所应用的手势都在同一个类中

UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)] ;
[pinchRecognizer setDelegate:self];
[self addGestureRecognizer:pinchRecognizer];

UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)] ;
[rotationRecognizer setDelegate:self];
[self addGestureRecognizer:rotationRecognizer];

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)] ;
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[self addGestureRecognizer:panRecognizer];

UITapGestureRecognizer *tapProfileImageRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)] ;
[tapProfileImageRecognizer setNumberOfTapsRequired:1];
[tapProfileImageRecognizer setDelegate:self];
[self addGestureRecognizer:tapProfileImageRecognizer];
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[self addGestureRecognizer:longPress];

所以重点是我正在处理可拖动对象，如上面(最上面)代码所示，它与该对象一起工作现在我想复制应用于可拖动对象的所有 GestureRecognizer 和委托(delegate)，所以当我使用副本时我应该不将所有 GestureRecognizer 和委托(delegate)单独应用于其副本

Answer 1

如果你的手势识别器对于你的类总是相同的，将它们设置在你的初始化器中，这样当你调用 init 时它们会在你的副本中重新创建。在你的copyWithZone:方法(无论如何都必须重新创建它们，因为一个手势识别器实例不能与多个 View 相关联)。

将您的委托(delegate)复制到您的 copyWithZone: 中方法与复制其他实例变量 ( obj->delegate = _delegate; ) 相同。

另请注意，UIView 的指定初始化程序是 initWithFrame:和 initWithCoder:而不是 init , 而且不需要设置 center , bounds , 和 frame同时因为它们相互修饰。只需使用 initWithFrame:而不是 init (除非您移动了绑定(bind)矩形的原点)。

dragable *obj = [[[self class] allocWithZone:zone] initWithFrame:self.frame];