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我在 ipad 应用程序中绘制签名它工作正常但问题是当它保存图像时它还保存了签名视图的边框我只想保存绘图区域不完整的签名视图这是我的代码

  signatureView=[[UIView alloc] initWithFrame:CGRectMake(100,100,800,500)];
signatureView.backgroundColor=[UIColor colorWithRed:242.0/255.f green:242/255.0f blue:242/255.0f alpha:1];


signatureView.layer.borderWidth =4;
signatureView.layer.borderColor = [UIColor colorWithRed:23.0/255.0f green:190/255.0f blue:210/255.0f alpha:1].CGColor;
signatureView.layer.cornerRadius=30;




[self.view addSubview:signatureView];



UIButton*OkButton = [UIButton buttonWithType:UIButtonTypeCustom];
   [OkButton setFrame:CGRectMake(320,448,118,49)];
    [OkButton setTitle:@"OK" forState:UIControlStateNormal];

[OkButton setImage:[UIImage imageNamed:@"okT.png"] forState:UIControlStateNormal];


   [OkButton addTarget:self action:@selector(onOKButtonClick) forControlEvents:UIControlEventTouchUpInside];
[signatureView addSubview:OkButton];

UILabel*textLabel=[[UILabel alloc] initWithFrame:CGRectMake(20,6,300,50)];

textLabel.font=[UIFont fontWithName:@"Helvetica-Bold" size:16];
textLabel.text=@"Use the touchscreen to sign here";
textLabel.backgroundColor=[UIColor clearColor];
textLabel.textColor=[UIColor grayColor];    
[signatureView addSubview:textLabel];


    drawScreen=[[MyLineDrawingView alloc]initWithFrame:CGRectMake(10,50,780,400)];
    [signatureView addSubview:drawScreen];
    [drawScreen release];


    //MyLineDrwaingView


   @interface MyLineDrawingView : UIView {

    UIBezierPath *myPath;
    UIColor *brushPattern;
   }

  @end


    #import "MyLineDrawingView.h"


    @implementation MyLineDrawingView

    - (id)initWithFrame:(CGRect)frame
  {

   self = [super initWithFrame:frame];
   if (self) {
    // Initialization code

    self.backgroundColor=[UIColor whiteColor];
    myPath=[[UIBezierPath alloc]init];
    myPath.lineCapStyle=kCGLineCapRound;
    myPath.miterLimit=0;
    myPath.lineWidth=10;
    //brushPattern=[UIColor redColor];
    brushPattern=[UIColor blackColor];

         }
        return self;
     }


    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    - (void)drawRect:(CGRect)rect
   {

     [brushPattern setStroke];
     [myPath strokeWithBlendMode:kCGBlendModeNormal alpha:1.0];
     }

    #pragma mark - Touch Methods

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

   UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
   [myPath moveToPoint:[mytouch locationInView:self]];

   }

  -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

  {

   UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
  [myPath addLineToPoint:[mytouch locationInView:self]];
   [self setNeedsDisplay];

  }


 -(void)onOKButtonClick {
 CGRect rect = [drawScreen bounds];   //use your signature view's Rect means Frame;
 UIGraphicsBeginImageContext(rect.size);
 CGContextRef context = UIGraphicsGetCurrentContext();
 [signatureView.layer renderInContext:context];   //this line is also important for you
 UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    signImageView.image = img;
 }
4

2 回答 2

2

我已经在我的代码中实现了它对我的工作如下:

.h 文件添加 UIGestureRecognizerDelegate

.m 字段

-(void)scrollGesture:(UIGestureRecognizer *)sender
{

    CGPoint touchLocation = [sender locationInView:scrollView];

    NSLog(@"%d %d %d %d",touchLocation.y > signatureViewOne.frame.origin.y,touchLocation.y < signatureViewOne.frame.origin.y+80,touchLocation.x > 3, touchLocation.x < 308);
    if ((touchLocation.y > signatureViewOne.frame.origin.y && touchLocation.y < signatureViewOne.frame.origin.y+80) &&(touchLocation.x > 3 && touchLocation.x < 308))
    {
        NSLog(@"Signone found");
        scrollView.scrollEnabled = NO;

    }
    else

    if ((touchLocation.y > signatureViewTwo.frame.origin.y && touchLocation.y < signatureViewTwo.frame.origin.y+80) &&(touchLocation.x > 3 && touchLocation.x < 308))
    {
        NSLog(@"SignTwo found");
        scrollView.scrollEnabled = NO;

    }
    else
    {
        NSLog(@"not found");
        scrollView.scrollEnabled = YES;
        sender.enabled = YES;
    }


} 
于 2013-08-29T06:40:06.347 回答
1

这个SO主题有完全相同的问题(在iOS上绘制和保存签名):iOS:如何将UIView的自绘内容转换为图像(广泛的通用解决方案返回空白图像)?

如果有帮助,请尝试标记您的问题已解决。

于 2013-08-29T06:29:39.697 回答