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我正在使用以下代碼使用UIBezierPath爲圖像着色。有顏色選擇器，用戶可以從中選擇顏色。隨着顏色的不斷變化，將會在圖像上繪製更多的路徑。但是，當用戶在圖像中的某個位置填充顏色後，從顏色選擇器中選擇顏色並再次在同一位置填充顏色。在這種情況下，以前繪製的顏色在那裏。我想刪除以前填充的顏色並希望填充新的顏色。這隻在用戶在同一位置填充顏色時纔有效。在這裏我已經得到UIBezierPath已經繪製的點。有一種方法UIBezierPath removeAllPoints。但它會從路徑中移除所有點。我只想從uibezierpath中刪除只有觸及的點。我怎樣才能做到這一點？如何刪除或覆蓋iPhone中的觸摸點bezierpath？
#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];
}