iOS绘图到屏幕
我正在使用核心图形绘制iOS屏幕,我设法能够在屏幕上绘制,但从我遵循的教程来看,绘图屏幕涵盖了nib文件中的所有其他内容。有人能帮我找出如何将绘图区域限制在我在笔尖中创建的视图内吗?我已经在这上面呆了一段时间了 我遵循的教程是: 我的代码:iOS绘图到屏幕,ios,core-graphics,draw,paint,Ios,Core Graphics,Draw,Paint,我正在使用核心图形绘制iOS屏幕,我设法能够在屏幕上绘制,但从我遵循的教程来看,绘图屏幕涵盖了nib文件中的所有其他内容。有人能帮我找出如何将绘图区域限制在我在笔尖中创建的视图内吗?我已经在这上面呆了一段时间了 我遵循的教程是: 我的代码: - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. //Set te
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
//Set text from previous
text.text = [[GameManager sharedManager] inText];
drawImage = [[UIImageView alloc] initWithImage:nil];
drawImage.frame = self.view.frame;
[self.view addSubview:drawImage];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
drawImage.image = nil;
return;
}
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(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 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 ([touch tapCount] == 2)
{
drawImage.image = nil;
return;
}
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(), 5.0);
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();
}
}
我已经成功地在一个子类中扩展了UIView,我从interface builder中的xib中引用了该子类。这样我就可以在interface builder中查看视图,移动它,并从interface builder中更改其属性。我按如下方式操作,但您可以按任意顺序操作: