到目前为止,我有一张图纸。我有不同的颜色按钮,但我不知道如何改变它们的颜色。我有所有的RGB颜色代码,但如何使用IBAction进行更改,它会更改CGContextSetRGBStrokeColor
UIGraphicsGetCurrentContext()
·H
@interface GameScreen : UIViewController {
BOOL mouseSwiped;
float lineWidth;
CGPoint lastPoint;
IBOutlet UIImageView *drawImage;
}
@end
的.m:
#import "GameScreen.h"
#import "DoodlePicViewController.h"
#import "Settings.h"
@implementation GameScreen
@synthesize theimageView,choosePhoto, takePhoto;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
lineWidth = thickness.value;
lastPoint = [touch locationInView:self.view];
lastPoint.y -= 20;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.y -= 20;
UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), lineWidth);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(),1.0, 1.0, 1.0, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if(!mouseSwiped) {
UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), lineWidth);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
@end
我真的想弄清楚,但我被困了☹
答案 0 :(得分:1)
我认为你可以使用一个滑块,因为它的值是从0到1.你可以得到3个滑块的值,然后将它们传递给CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(),1.0,1.0,1.0,1.0)没有IB,你也可以这样做。我认为IB不是一件好事。