如何彩色圖像無論iphone中的圖像中呈現的顏色？

Question

我正在使用以下代碼在觸摸event.I具有子類uiview，並使用下面的代碼來做到這一點。它是工作，但不同的部分圖像上的顏色是不同的。因爲我用紅色着色圖像，有綠色，黃色或其他顏色出現在圖像的不同部分。然後紅色根據圖像中已經存在的顏色而具有不同的效果。替代地，我想要在整個圖像中填充相同的紅色（或者選擇的任何顏色）。我怎麼能做到這一點？

@synthesize selImage,isReset; 

- (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]; 

     NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:myPath, @"Path", brushPattern, @"Color", nil]; 
     [arrBezierPaths addObject:dict]; 
    } 
    return self; 
} 

// Only override drawRect: if you perform custom drawing. 
// An empty implementation adversely affects performance during animation. 
- (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++) 
    { 
     UIBezierPath *tempErasePath = [[UIBezierPath alloc] init]; 
     NSDictionary *dictTemp = [arrBezierPaths objectAtIndex:0]; 
     UIBezierPath *temppath = [dictTemp valueForKey:@"Path"]; 
     if ([temppath containsPoint:pointTouched]) 
     { 
      //[temppath removeAllPoints]; 
     } 
    } 

    [globalPath addLineToPoint:[mytouch locationInView:self]]; 

    [self setNeedsDisplay]; 
} 

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
} 

-(void)changeColor:(UIColor *)color 
{ 
    [arrRemovePaths removeAllObjects]; 
    UIBezierPath *temp = [[UIBezierPath alloc] init]; 

    temp.lineWidth = 30; 
    UIColor *brushColor = color; 
    NSLog(@"initWithFrame method called"); 
    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:temp, @"Path", brushColor, @"Color", nil]; 
    [temp release]; 
    [arrBezierPaths addObject:dict]; 
    brushPattern = [color retain]; 
    [self setNeedsDisplay]; 
} 

- (void)dealloc 
{ 
    // [brushPattern release]; 
    [super dealloc]; 
} 

Answer 1

嘗試

[globalPath strokeWithBlendMode:kCGBlendModeCopy alpha:1.0]; 
      ; 

如果你想更換線[globalPath strokeWithBlendMode:kCGBlendModeOverlay alpha:1.0];不同的混合模式的作品怎麼看here（圖2-1）。