我正在使用以下代码为图像着色UIBezierPath。有颜色选择器，用户可以从中选择颜色。并使用该颜色贝塞尔路径将绘制在图像上。但是当用户在图像中的某个位置填充颜色时，它会从颜色选择器中选择颜色并再次在同一位置填充颜色。在这种情况下，以前绘制的颜色就在那里。我想删除以前填充的颜色并想填充新颜色。仅当用户在相同位置填充颜色时。在这里，我已经得到了UIBezierPath已经绘制的点。有一种方法UIBezierPath removeAllPoints。但它正在从路径中删除所有点。我只想从 uibezierpath 中删除唯一的接触点。我怎样才能做到这一点？
#import "MyLineDrawingView.h"
@implementation MyLineDrawingView
@synthesize selImage;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
arrBezierPaths=[[NSMutableArray alloc]init ];
globalPath=[[UIBezierPath alloc]init];
myPath=[[UIBezierPath alloc]init];
self.userInteractionEnabled = TRUE;
myPath.lineWidth=30;
brushPattern=[UIColor redColor];
NSLog(@"initWithFrame method called");
NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:myPath,@"Path",brushPattern,@"Color", nil];
[arrBezierPaths addObject:dict];
}
return self;
}
- (void)drawRect:(CGRect)rect
{
for (int i=0; i<[arrBezierPaths count]; i++)
{
NSDictionary *dict=[arrBezierPaths objectAtIndex:i];
UIColor *tempBrushpatter=[[UIColor alloc]init ];
tempBrushpatter=[dict valueForKey:@"Color"];
globalPath=[dict valueForKey:@"Path"];
[globalPath strokeWithBlendMode:kCGBlendModeOverlay alpha:1.0];
[tempBrushpatter setStroke];
}
}
#pragma mark - Touch Methods
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
[globalPath moveToPoint:[mytouch locationInView:self]];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
CGPoint pointTouched = [mytouch locationInView:self];
for(int i=0;i<[arrBezierPaths count];i++)
{
NSDictionary *dictTemp=[arrBezierPaths objectAtIndex:0];
UIBezierPath *temppath=[dictTemp valueForKey:@"Path"];
if([temppath containsPoint:pointTouched])
{
// [tempPath removeAllPoints];
NSLog(@"This point already contain some path");
}
}
[globalPath addLineToPoint:[mytouch locationInView:self]];
[self setNeedsDisplay];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}
-(void)changeColor:(UIColor *)color
{
UIBezierPath *temp=[[UIBezierPath alloc]init];
// self.userInteractionEnabled = TRUE;
temp.lineWidth=30;
UIColor *brushColor=color;
NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:temp,@"Path",brushColor,@"Color", nil];
[temp release];
[arrBezierPaths addObject:dict];
brushPattern=[color retain];
[self setNeedsDisplay];
}