如何为iPhone应用程序制作拼贴形状？

Question

我想要许多像心形，星形等特殊形状的拼贴... 任何人都可以告诉我如何以编程方式在目标c的iPhone应用程序中执行此操作？

Answer 1

如果您几乎没有使用Core Graphics的经验，并且想要以编程方式生成这些形状，我建议您使用名为PaintCode的Mac应用程序。

您可以使用它来绘制形状，并生成相应的Objective-C绘图代码。

Answer 2

使用此代码。这里图片是从PhotoLibrary中挑选出来的，然后用手势将它们移动，缩放等等。我使用所有的手势来帮助你做任何平移，捏和旋转任何你放置的图像。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 

[picker dismissModalViewControllerAnimated:YES]; 
imageCollage = [[UIImageView alloc]initWithFrame:CGRectMake(80, 80, 150, 150)]; 
[imageCollage setUserInteractionEnabled:YES]; 
imageCollage.image = [info objectForKey:UIImagePickerControllerOriginalImage]; 

holderView = [[UIView alloc] initWithFrame:CGRectMake(0,0,imageCollage.frame               .size.width, imageCollage.frame.size.height)]; 
holderView.layer.cornerRadius = 6; 
holderView.clipsToBounds = YES; 
imageview = [[UIImageView alloc] initWithFrame:[holderView frame]]; 
[imageview setImage:imageCollage.image]; 
[holderView addSubview:imageview]; 

UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)]; 
[pinchRecognizer setDelegate:self]; 
[holderView addGestureRecognizer:pinchRecognizer]; 

UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)]; 
[rotationRecognizer setDelegate:self]; 
[holderView addGestureRecognizer:rotationRecognizer]; 

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)]; 
[panRecognizer setMinimumNumberOfTouches:1]; 
[panRecognizer setMaximumNumberOfTouches:1]; 
[panRecognizer setDelegate:self]; 
[holderView addGestureRecognizer:panRecognizer]; 

DeleteImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)]; 
[DeleteImage setImage:[UIImage imageNamed:@"DeleteRed.png"]]; 
[holderView addSubview:DeleteImage]; 
DeleteImage.userInteractionEnabled = YES; 

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)]; 
[tapRecognizer setNumberOfTapsRequired:1]; 
[tapRecognizer setDelegate:self]; 
[DeleteImage addGestureRecognizer:tapRecognizer]; 

[BaseView addSubview:holderView]; 

[Trash setImage:[UIImage imageNamed:@"12456977871712665073hrum_trash.svg.med.png"] forState:UIControlStateNormal]; 
} 

    -(void)scale:(id)sender 
    { 
BaseView.clipsToBounds = YES; 
[BaseView bringSubviewToFront:[(UIPinchGestureRecognizer*)sender view]]; 

if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 

    lastScale = 1.0; 
    return; 
} 
CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]); 

CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform; 
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale); 

[[(UIPinchGestureRecognizer*)sender view] setTransform:newTransform]; 

lastScale = [(UIPinchGestureRecognizer*)sender scale]; 
    } 

    -(void)rotate:(id)sender 
    { 

[BaseView bringSubviewToFront:[(UIRotationGestureRecognizer*)sender view]]; 

if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 

    lastRotation = 0.0; 
    return; 
} 

CGFloat rotation = 0.0 - (lastRotation - [(UIRotationGestureRecognizer*)sender rotation]); 

CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform; 
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation); 

[[(UIRotationGestureRecognizer*)sender view] setTransform:newTransform]; 

lastRotation = [(UIRotationGestureRecognizer*)sender rotation]; 
    } 

    -(void)move:(id)sender 
    { 
[[[(UITapGestureRecognizer*)sender view] layer] removeAllAnimations]; 
BaseView.clipsToBounds = YES; 
[BaseView bringSubviewToFront:[(UIPanGestureRecognizer*)sender view]]; 
CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view]; 

if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) { 

    firstX = [[sender view] center].x; 
    firstY = [[sender view] center].y; 
} 

translatedPoint = CGPointMake(firstX+translatedPoint.x, firstY+translatedPoint.y); 

[[sender view] setCenter:translatedPoint]; 

if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 

    CGFloat finalX = translatedPoint.x + (.20*[(UIPanGestureRecognizer*)sender velocityInView:self.view].x); 
    CGFloat finalY = translatedPoint.y + (.20*[(UIPanGestureRecognizer*)sender velocityInView:self.view].y); 

    if(UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation])) { 

     if(finalX < 0) { 

      finalX = 0; 
     } 

     else if(finalX > 260) { 

      finalX = 260; 
     } 

     if(finalY < 0) { 

      finalY = 0; 
     } 

     else if(finalY > 416) { 

      finalY = 416; 
     } 
    } 

    else { 

     if(finalX < 0) { 

      finalX = 0; 
     } 

     else if(finalX > 416) { 

      finalX = 260; 
     } 

     if(finalY < 0) { 

      finalY = 0; 
     } 

     else if(finalY > 260) { 

      finalY = 416; 
     } 
    } 

    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:.35]; 
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; 
    [[sender view] setCenter:CGPointMake(finalX, finalY)]; 
    [UIView commitAnimations]; 
} 
    } 



     -(void)tapped:(UIGestureRecognizer *)recogniser 
     { 
    NSLog(@"%@",recogniser.view); 
    [Trash setImage:[UIImage imageNamed:@"trash_bin_recycle_quit_terminate_error_cancel_close_exit.png"] forState:UIControlStateNormal]; 

    [[[recogniser view] superview] removeFromSuperview]; 
} 

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { 

    return ![gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]; 
} 

对鳕鱼的任何疑问，请随时问：）...编码快乐..