核心小区缩放 - pinchgesture

我有一个捏缩放手势的问题，主要问题是，当我缩放我放大视图的中心，所以如果我捏在右上角或底部放大总是在中心看法。这是我的代码，我怎样才能编辑它在缩放触摸的中间进行缩放？核心小区缩放 - pinchgesture

- (void)handlePinchGesture:(UIPinchGestureRecognizer *)gestureRecognizer{ 

if (gestureRecognizer.state == UIGestureRecognizerStateBegan) { 

    scala = [gestureRecognizer scale]; 
    nextScala = [gestureRecognizer scale]; 

    //NSLog(@"Scala: %f Gesture Scala %f",scala,[gestureRecognizer scale]); 
} 
else if (gestureRecognizer.state == UIGestureRecognizerStateChanged) { 


    //CGPoint pointUno = [gestureRecognizer locationOfTouch:0 inView:[gestureRecognizer view]]; 
    //CGPoint pointDue = [gestureRecognizer locationOfTouch:1 inView:[gestureRecognizer view]]; 

    CGPoint point = [gestureRecognizer locationInView:[gestureRecognizer view]]; 



    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace; 

    double minX = plotSpace.xRange.minLimitDouble; 
    double maxX = plotSpace.xRange.maxLimitDouble; 
    double minY = plotSpace.yRange.minLimitDouble; 
    double maxY = plotSpace.yRange.maxLimitDouble; 

    //NSLog(@"Scala: %f Gesture Scala %f Velocity: %f",scala,[gestureRecognizer scale],[gestureRecognizer velocity]); 
    double lenghtX = maxX - minX; 
    double lenghtY = maxY - minY; 

    float stepScale = lenghtX/25; 

    if ([gestureRecognizer scale] < nextScala) { 
     minX = plotSpace.xRange.minLimitDouble - stepScale; 
     maxX = plotSpace.xRange.maxLimitDouble + stepScale; 
     minY = plotSpace.yRange.minLimitDouble - stepScale; 
     maxY = plotSpace.yRange.maxLimitDouble + stepScale; 
    } 
    else { 
     minX = plotSpace.xRange.minLimitDouble + stepScale; 
     maxX = plotSpace.xRange.maxLimitDouble - stepScale; 
     minY = plotSpace.yRange.minLimitDouble + stepScale; 
     maxY = plotSpace.yRange.maxLimitDouble - stepScale; 
    } 

    lenghtX = maxX - minX; 
    lenghtY = maxY - minY; 

    NSLog(@"Old X: %f Y: %f",point.x,point.y); 
    NSLog(@"New X: %f Y: %f",lenghtX-point.x,lenghtY-point.y); 

    if (lenghtX > 0.05 && lenghtX < 4500) { 
     plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(minX) length:CPTDecimalFromFloat(lenghtX)]; 
     plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(minY) length:CPTDecimalFromFloat(lenghtY)]; 
     nextScala = [gestureRecognizer scale]; 
    } 
} 
else if (gestureRecognizer.state == UIGestureRecognizerStateEnded) { 

    [self performSelectorInBackground:@selector(getValues) withObject:nil];

// [self getValues]; } }

来源

2013-04-30 kikko088

使用该地块空间的方法做缩放：

-(void)scaleBy:(CGFloat)interactionScale aboutPoint:(CGPoint)interactionPoint;

来源

2013-05-01 01:06:48

我需要改变阵列值，并做到这一点在此我喜欢使用大量的内存，我需要改变的值时，冲完了。我检测到hostingview捏手势，现在似乎工作 – kikko088 2013-05-01 09:07:49

核心小区缩放 - pinchgesture

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