我有一个由bezierPaths制成的正方形的类，你可以通过靠近一侧并拖动它来改变正方形的大小。
现在我可以拖动和释放一次，下次我收到以下错误：
2015-01-20 14：20：36.356 BezierPaths [196：3437] *** - [CALayer convertPoint：fromLayer：]：消息发送到解除分配的实例0x1742251c0
为什么它第二次不起作用？
这是班级：
@implementation EditBezierView
{
UIBezierPath *path;
UIImage *incrementalImage;
CGPoint pts[9];
NSMutableArray *pathPoints;
NSMutableArray *controlPoints;
BOOL pressedPoint;
int index;
float xStart;
float yStart;
int closestIndex;
CGPoint closestComparePoint;
bool moveControl;
int counter;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super initWithCoder:aDecoder])
{
[self setMultipleTouchEnabled:NO];
[self setBackgroundColor:[UIColor clearColor]];
path = [UIBezierPath bezierPath];
[path setLineWidth:1.0];
pathPoints = [NSMutableArray array];
controlPoints = [NSMutableArray array];
}
return self;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setMultipleTouchEnabled:NO];
path = [UIBezierPath bezierPath];
[path setLineWidth:2.0];
counter = 0;
}
return self;
}
- (void)initValues
{
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(47.0, 130.0)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(14.0, 230.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(26.0, 150.0)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(22.0, 320.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(9.0, 270.0)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(90.0, 420.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(24.0, 380.0)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(230.0, 420.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(170.0, 460.0)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(300.0, 320.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(280.0, 390)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(307.0, 220.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(315.0, 260.0)]];
[pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake(270.0, 130.0)]];
[controlPoints addObject:[NSValue valueWithCGPoint:CGPointMake(300.0, 160.0)]];
[self drawPaths];
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
[[UIColor blueColor] setStroke];
[path stroke];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
counter++;
NSLog(@"%d", counter);
[self.layer.sublayers makeObjectsPerformSelector:@selector(removeFromSuperlayer)];
UITouch *currentTouch = [touches anyObject];
CGPoint startPt = [currentTouch locationInView:self];
if(moveControl)
{
float xOs = [(NSValue*)[controlPoints objectAtIndex:closestIndex] CGPointValue].x;
float yOs = [(NSValue*)[controlPoints objectAtIndex:closestIndex] CGPointValue].y;
[controlPoints replaceObjectAtIndex:closestIndex withObject:[NSValue valueWithCGPoint:CGPointMake(xOs - (xStart-startPt.x), yOs - (yStart - startPt.y))]];
}
else
{
float xOs = [(NSValue*)[pathPoints objectAtIndex:closestIndex] CGPointValue].x;
float yOs = [(NSValue*)[pathPoints objectAtIndex:closestIndex] CGPointValue].y;
[pathPoints replaceObjectAtIndex:closestIndex withObject:[NSValue valueWithCGPoint:CGPointMake(xOs - (xStart-startPt.x), yOs - (yStart - startPt.y))]];
}
[self drawPaths];
xStart = startPt.x;
yStart = startPt.y;
}
- (void)drawPaths
{
path = [UIBezierPath bezierPath];
for(int i = 1; i < [pathPoints count]; i++)
{
//Draw path
[path moveToPoint:((NSValue*)[pathPoints objectAtIndex:i-1]).CGPointValue];
[path addQuadCurveToPoint:((NSValue*)[pathPoints objectAtIndex:i]).CGPointValue controlPoint:((NSValue*)[controlPoints objectAtIndex:i-1]).CGPointValue];
//Draw points
if(i == 1)
{
[self addrectangle:((NSValue*)[pathPoints objectAtIndex:i-1]).CGPointValue];
[self addrectangle:((NSValue*)[pathPoints objectAtIndex:i]).CGPointValue];
[self addQuadrectangle:((NSValue*)[controlPoints objectAtIndex:i-1]).CGPointValue];
}
else
{
[self addrectangle:((NSValue*)[pathPoints objectAtIndex:i]).CGPointValue];
[self addQuadrectangle:((NSValue*)[controlPoints objectAtIndex:i-1]).CGPointValue];
}
}
[self setNeedsDisplay];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *currentTouch = [touches anyObject];
CGPoint startPt = [currentTouch locationInView:self];
closestComparePoint = startPt;
xStart = startPt.x;
yStart = startPt.y;
[self findNearestPoint];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//[self drawPath];
}
-(void)findNearestPoint
{
int pathClosestIndex = 0;
CGFloat xDist;
CGFloat yDist;
CGFloat Controldistance = 12401240;
CGFloat Pathdistance = 12401240;
for(int i = 0; i < [controlPoints count]; i++)
{
xDist = ABS([(NSValue*)[controlPoints objectAtIndex:i] CGPointValue].x - closestComparePoint.x);
yDist = ABS([(NSValue*)[controlPoints objectAtIndex:i] CGPointValue].y - closestComparePoint.y);
if(sqrt((xDist * xDist) + (yDist * yDist)) < Controldistance)
{
Controldistance = sqrt((xDist * xDist) + (yDist * yDist));
closestIndex = i;
}
}
for(int i = 0; i < [pathPoints count]; i++)
{
xDist = ABS([(NSValue*)[pathPoints objectAtIndex:i] CGPointValue].x - closestComparePoint.x);
yDist = ABS([(NSValue*)[pathPoints objectAtIndex:i] CGPointValue].y - closestComparePoint.y);
if(sqrt((xDist * xDist) + (yDist * yDist)) < Pathdistance)
{
Pathdistance = sqrt((xDist * xDist) + (yDist * yDist));
pathClosestIndex = i;
}
}
if(Pathdistance < Controldistance)
{
moveControl = NO;
closestIndex = pathClosestIndex;
}
else
{
moveControl = YES;
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesEnded:touches withEvent:event];
pressedPoint = NO;
}
-(void)removeRectangles{
[self.layer.sublayers makeObjectsPerformSelector:@selector(removeFromSuperlayer)];
}
-(void)addrectangle:(CGPoint) center{
int offset = 8;
UIBezierPath *path2 = [UIBezierPath bezierPath];
[path2 moveToPoint:CGPointMake(center.x - offset, center.y - offset)];
// # Entry Point with 10px white frame
[path2 moveToPoint:CGPointMake(center.x - offset, center.y - offset)];
// # Keeping 10px frame with iPhone's 450 on y-axis
[path2 addLineToPoint:CGPointMake(center.x - offset, center.y + offset)];
// path2 Substracting 10px for frame on x-axis, and moving 450 in y-axis
[path2 addLineToPoint:CGPointMake(center.x + offset, center.y + offset)];
// # Moving up to 1st step 10px line, 310px on the x-axis
[path2 addLineToPoint:CGPointMake(center.x + offset, center.y - offset)];
// # Back to entry point
[path2 addLineToPoint:CGPointMake(center.x - offset, center.y - offset)];
// 4th Create a CAShapeLayer that uses that UIBezierPath:
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = [path2 CGPath];
shapeLayer.strokeColor = [[UIColor blueColor] CGColor];
shapeLayer.lineWidth = 1.0;
shapeLayer.fillColor = [[UIColor clearColor] CGColor];
// 5th add shapeLayer as sublayer inside layer view
[self.layer addSublayer:shapeLayer];
}
-(void)addQuadrectangle:(CGPoint) center{
int offset = 4;
UIBezierPath *path2 = [UIBezierPath bezierPath];
[path2 moveToPoint:CGPointMake(center.x - offset, center.y - offset)];
// # Entry Point with 10px white frame
[path2 moveToPoint:CGPointMake(center.x - offset, center.y - offset)];
// # Keeping 10px frame with iPhone's 450 on y-axis
[path2 addLineToPoint:CGPointMake(center.x - offset, center.y + offset)];
// path2 Substracting 10px for frame on x-axis, and moving 450 in y-axis
[path2 addLineToPoint:CGPointMake(center.x + offset, center.y + offset)];
// # Moving up to 1st step 10px line, 310px on the x-axis
[path2 addLineToPoint:CGPointMake(center.x + offset, center.y - offset)];
// # Back to entry point
[path2 addLineToPoint:CGPointMake(center.x - offset, center.y - offset)];
// 4th Create a CAShapeLayer that uses that UIBezierPath:
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = [path2 CGPath];
shapeLayer.strokeColor = [[UIColor redColor] CGColor];
shapeLayer.lineWidth = 1.0;
shapeLayer.fillColor = [[UIColor clearColor] CGColor];
// 5th add shapeLayer as sublayer inside layer view
[self.layer addSublayer:shapeLayer];
}
-(int)findOrigoInX
{
int closestToX = [(NSValue *)[pathPoints firstObject] CGPointValue].x;
for(int i = 1; i < [pathPoints count]; i++)
{
if([(NSValue *)[pathPoints objectAtIndex:i] CGPointValue].x < closestToX)
{
closestToX = [(NSValue *)[pathPoints objectAtIndex:i] CGPointValue].x;
}
}
return closestToX;
}
-(int)findOrigoInY
{
int closestToY = [(NSValue *)[pathPoints firstObject] CGPointValue].y;
for(int i = 1; i < [pathPoints count]; i++)
{
if([(NSValue *)[pathPoints objectAtIndex:i] CGPointValue].y > closestToY)
{
closestToY = [(NSValue *)[pathPoints objectAtIndex:i] CGPointValue].y;
}
}
return closestToY;
}
-(NSMutableArray*)generateKoordinateArray
{
NSLog(@"count in pathPoints : %lu", (unsigned long)[pathPoints count]);
NSMutableArray *storeArray = [[NSMutableArray alloc] init];
BezierCsvFormat *storeBezier = [[BezierCsvFormat alloc] init];
NSString *stringValueX;
NSString *stringValueY;
int xOffset = [self findOrigoInX];
NSLog(@"x offset : %d", xOffset);
int yOffset = [self findOrigoInY];
NSLog(@"y offset : %d", yOffset);
for(int i = 1; i < [pathPoints count]; i++)
{
storeBezier = [[BezierCsvFormat alloc] init];
stringValueX = [NSString stringWithFormat:@"%d", (int)[(NSValue *)[pathPoints objectAtIndex:i-1] CGPointValue].x - xOffset];
stringValueY = [NSString stringWithFormat:@"%d", ABS((int)[(NSValue *)[pathPoints objectAtIndex:i-1] CGPointValue].y - yOffset)];
[storeBezier setp0:[NSString stringWithFormat:@"%@,%@",stringValueX, stringValueY]];
stringValueX = [NSString stringWithFormat:@"%d", (int)[(NSValue *)[controlPoints objectAtIndex:i-1] CGPointValue].x - xOffset];
int multiplicator = 1;
if((int)[(NSValue *)[controlPoints objectAtIndex:i-1] CGPointValue].y > yOffset)
{
multiplicator = multiplicator * -1;
}
stringValueY = [NSString stringWithFormat:@"%d", multiplicator * ABS((int)[(NSValue *)[controlPoints objectAtIndex:i-1] CGPointValue].y - yOffset)];
[storeBezier setp1:[NSString stringWithFormat:@"%@,%@",stringValueX, stringValueY]];
stringValueX = [NSString stringWithFormat:@"%d", (int)[(NSValue *)[pathPoints objectAtIndex:i] CGPointValue].x - xOffset];
stringValueY = [NSString stringWithFormat:@"%d", ABS((int)[(NSValue *)[pathPoints objectAtIndex:i] CGPointValue].y - yOffset)];
[storeBezier setp2:[NSString stringWithFormat:@"%@,%@",stringValueX, stringValueY]];
[storeArray addObject:storeBezier];
}
NSLog(@"count in storeArray : %lu", (unsigned long)[storeArray count]);
return storeArray;
}
- (NSMutableArray*)printCoordinateSystem
{
NSMutableArray *tempArray = [self generateKoordinateArray];
return tempArray;
NSLog(@"count in tempArray : %lu", (unsigned long)[tempArray count]);
for(int i = 0; i < [tempArray count]; i++)
{
NSLog(@"p0 : %@ p1 : %@ p2 : %@", [(BezierCsvFormat*)[tempArray objectAtIndex:i] getp0], [(BezierCsvFormat*)[tempArray objectAtIndex:i] getp1], [(BezierCsvFormat*)[tempArray objectAtIndex:i] getp2]);
}
}
-(void)resetView{
@try {
[path removeAllPoints];
pathPoints = [NSMutableArray array];
[self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
[self.layer.sublayers makeObjectsPerformSelector:@selector(removeFromSuperlayer)];
[self setNeedsDisplay];
}
@catch (NSException *exception) {
[self resetView];
}
@finally {
}
}