Question

除了图形只能在视图中工作外，一切正常！我在scrollView上有一个UIImageView。滚动视图是我的键盘将我的项目提升到键盘后面看，但是在我添加scrollView之前图形确实有效，所以我添加了UIImage来在窗体上绘制。现在，如果我将手指从视图拖到UIImageView，它将绘制，而不是从UIImageView开始。我做错了什么......

 - (void)viewDidLoad {
    [super viewDidLoad];
    drawImage = [[UIImageView alloc] initWithImage:nil];
        drawImage.frame = self.view.frame;
    [self.graphicImageView addSubview:drawImage];
    mouseMoved = 0;
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
    lastPoint = [touch locationInView:self.graphicImageView];
    lastPoint.y -= 0;

}

 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
        NSLog(@"Touches Moved");

        mouseSwiped = YES;

        UITouch *touch = [touches anyObject];
        CGPoint currentPoint = [touch locationInView:self.graphicImageView];
        currentPoint.y -= 0;

        UIGraphicsBeginImageContext(self.graphicImageView.frame.size);

        [drawImage.image drawInRect:CGRectMake(0, 0, self.graphicImageView.frame.size.width, self.graphicImageView.frame.size.height)];

        CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);

        CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 1.0); //width
        CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 1.0, 1.0); //color red, green, blue, alpha
        CGContextBeginPath(UIGraphicsGetCurrentContext());
        CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
        CGContextStrokePath(UIGraphicsGetCurrentContext());
        drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        lastPoint = currentPoint;

        mouseMoved++;

        if (mouseMoved == 10) {
            mouseMoved = 0;
        }
    }


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touches Ended");


    UITouch *touch = [touches anyObject];

    if ([touch tapCount] == 2) {
       // drawImage.image = nil;
    //    return;
    }


    if(!mouseSwiped) {
        UIGraphicsBeginImageContext(self.graphicImageView.frame.size);
        [drawImage.image drawInRect:CGRectMake(0, 0, self.graphicImageView.frame.size.width, self.graphicImageView.frame.size.height)];
        CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
        CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 1.0);//width
        CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 1.0, 1.0);  //color
        CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextStrokePath(UIGraphicsGetCurrentContext());
        CGContextFlush(UIGraphicsGetCurrentContext());
        drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }

Answer 1

好的，UIImageView现在位于scrollView下面。

（void）viewDidLoad {

//键盘 // ---设置滚动视图的可视框架---

scrollView1.frame = CGRectMake（0,44,359,457）;

// ---设置滚动视图的内容大小---

[scrollView1 setContentSize：CGSizeMake（359,457）];

[[NSNotificationCenter defaultCenter] addObserver：self 选择：@选择（keyboardWasShown :) name：UIKeyboardDidShowNotification对象：nil];

[[NSNotificationCenter defaultCenter] addObserver：self 选择：@选择（keyboardWillBeHidden :) name：UIKeyboardWillHideNotification对象：nil];

的NSLog（@ “viewDidLoad中”）; drawImage = [[UIImageView alloc] initWithImage：nil]; drawImage.frame = self.view.frame; [self.view addSubview：drawImage];
mouseMoved = 0;

self.graphicImageView.userInteractionEnabled = TRUE; 自＆GT; scrollView1.userInteractionEnabled = TRUE;

[super viewDidLoad];

}
（void）touchesBegan：（NSSet *）触及withEvent：（UIEvent *）事件{

mouseSwiped = NO; UITouch * touch = [触及anyObject];

lastPoint = [touch locationInView：self.graphicImageView]; lastPoint.y - = 0;

NSLog（@“Touches Began”）; }

（void）touchesMoved：（NSSet *）触及withEvent：（UIEvent *）event {
```
NSLog(@"Touches Moved");

mouseSwiped = YES;

UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:drawImage];
currentPoint.y -= 0;

UIGraphicsBeginImageContext(drawImage.frame.size);

[drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];

CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);

CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 1.0); //width
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 1.0, 1.0); //color red, green, blue, alpha
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

lastPoint = currentPoint;

mouseMoved++;

if (mouseMoved == 10) {
    mouseMoved = 0;
}
```
}
- （void）touchesEnded：（NSSet *）触及withEvent：（UIEvent *）event {
NSLog（@“Touches Ended”）;

UITouch * touch = [触及anyObject];

if（[touch tapCount] == 2）{ theSwitch.on = NO; drawImage.userInteractionEnabled = FALSE; theSwitchLabel.text = @“Pen is Off”; doubleTapLabel.hidden = TRUE; 返回; }

if（！mouseSwiped）{ UIGraphicsBeginImageContext（drawImage.frame.size）; [drawImage.image drawInRect：CGRectMake（0,0，drawImage.frame.size.width，drawImage.frame.size.height）]; CGContextSetLineCap（UIGraphicsGetCurrentContext（），kCGLineCapRound）; CGContextSetLineWidth（UIGraphicsGetCurrentContext（），1.0）; // width CGContextSetRGBStrokeColor（UIGraphicsGetCurrentContext（），0.0,0.0,1.0,1.0）; //颜色 CGContextMoveToPoint（UIGraphicsGetCurrentContext（），lastPoint.x，lastPoint.y）; CGContextAddLineToPoint（UIGraphicsGetCurrentContext（），lastPoint.x，lastPoint.y）; CGContextStrokePath（UIGraphicsGetCurrentContext（））; CGContextFlush（UIGraphicsGetCurrentContext（））; drawImage.image = UIGraphicsGetImageFromCurrentImageContext（）; UIGraphicsEndImageContext（）;

} }
- （IBAction）switchtheswitch：（id）sender {
if（theSwitch.on）{ theSwitchLabel.text = @“Pen is On”; drawImage.userInteractionEnabled = TRUE; doubleTapLabel.hidden = FALSE; } 其他{ theSwitchLabel.text = @“Pen is Off”; drawImage.userInteractionEnabled = FALSE; }

}

触摸UIImage没有开火

1 个答案: