核心小區縮放 - pinchgesture

我有一個捏縮放手勢的問題，主要問題是，當我縮放我放大視圖的中心，所以如果我捏在右上角或底部放大總是在中心看法。這是我的代碼，我怎樣才能編輯它在縮放觸摸的中間進行縮放？核心小區縮放 - 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]; } }

來源

2013-04-30 kikko088

使用該地塊空間的方法做縮放：

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

來源

2013-05-01 01:06:48

我需要改變陣列值，並做到這一點在此我喜歡使用大量的內存，我需要改變的值時，衝完了。我檢測到hostingview捏手勢，現在似乎工作 – kikko088 2013-05-01 09:07:49

核心小區縮放 - pinchgesture

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