有沒有可以在iOS上用觸摸畫線的SDK？

有沒有我可以用來畫線的框架。基本上我想增加客戶在iPad/iPhone上簽名並將其作爲圖像捕獲的能力。有沒有可以在iOS上用觸摸畫線的SDK？

任何幫助非常感謝。

謝謝。

來源

2011-07-21 Dev

可能的重複http://stackoverflow.com/questions/679983/how-to-draw-signature-with-lines-on-iphone-screen – visakh7

您可以使用UIKIT框架中提供的核心圖形來滿足您的要求。

我在我的應用程序中有一個類似的需求與不同的用途，如果需要我可以爲您提供的代碼。

TNQ

.h文件中

#import <UIKit/UIKit.h> 
typedef enum _DrawingMode{ 
DrawingModePen =0, 
DrawingModeEraser=1, 
} DrawingMode; 
@interface DrawingView : UIView { 
CGPoint lastPoint; 
UIImageView *drawImage; 
BOOL mouseSwiped; 
int mouseMoved; 
DrawingMode mode; 
UIColor *_drawingPenColor; 
} 
@property (nonatomic, retain) UIColor *drawingPenColor; 
@property (nonatomic) DrawingMode mode; 

@property (nonatomic, retain) UIImageView *imageView; 
@property (nonatomic,retain)UIImageView *drawImage; 
@end

#import "DrawingView.h" 


@implementation DrawingView 

@synthesize mode, drawingPenColor=_drawingPenColor, imageView=drawImage; 


-(void)initialize{ 
    drawImage = [[UIImageView alloc] initWithImage:nil]; 
    self.autoresizesSubviews = YES; 
    drawImage.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight); 
    drawImage.frame = self.bounds; 
    [self addSubview:drawImage]; 
    self.backgroundColor = [UIColor clearColor]; 
    mouseMoved = 0; 
    _drawingPenColor = [[UIColor alloc] initWithWhite:0.0 alpha:1.0]; 
} 

-(void)maskImage:(UIImage *)image withMask:(UIImage *)maskImage 
{ 
    CGImageRef maskRef = maskImage.CGImage; 
    CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), 
             CGImageGetHeight(maskRef), 
             CGImageGetBitsPerComponent(maskRef), 
             CGImageGetBitsPerPixel(maskRef), 
             CGImageGetBytesPerRow(maskRef), 
             CGImageGetDataProvider(maskRef), NULL, false); 
    CGImageRef masked = CGImageCreateWithMask([image CGImage], mask); 
    UIImage *tempImage = [[UIImage alloc] initWithCGImage:masked]; 
    //self.clippedImage = tempImage; 
    [tempImage release]; 
    CFRelease(masked); 
    CFRelease(mask); 
} 

-(void)awakeFromNib{ 
    [self initialize]; 
} 

- (id)initWithFrame:(CGRect)frame { 
    if ((self = [super initWithFrame:frame])) { 
     // Initialization code 
     [self initialize]; 
    } 
    return self; 
} 

- (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]; 
    //lastPoint.y -= 20; 
    NSLog(@"touches begin"); 

} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 
    mouseSwiped = YES; 

    UITouch *touch = [touches anyObject]; 
    CGPoint currentPoint = [touch locationInView:self]; 
    //currentPoint.y -= 20; 


    UIGraphicsBeginImageContext(self.bounds.size); 
    [drawImage.image drawInRect:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)]; 
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); 
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0); 
    if (mode == DrawingModePen) { 
     NSLog(@"drawing"); 
     CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [_drawingPenColor CGColor]); 
    } 
    else { 
     CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [[UIColor clearColor] CGColor]); 

     CGContextBeginPath(UIGraphicsGetCurrentContext()); 


     CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); 
     CGContextClearRect (UIGraphicsGetCurrentContext(), CGRectMake(lastPoint.x, lastPoint.y, 20, 20)); 
     CGContextStrokePath(UIGraphicsGetCurrentContext()); 

     NSLog(@"clearing"); 
      } 
    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 { 

    UITouch *touch = [touches anyObject]; 

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


    if(!mouseSwiped) { 
     UIGraphicsBeginImageContext(self.bounds.size); 
     [drawImage.image drawInRect:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)]; 
     CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); 
     CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0); 
     CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); 
     CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); 
     if (mode == DrawingModePen) { 
      CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [_drawingPenColor CGColor]); 
     } 
     else { 
      CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [self.backgroundColor CGColor]); 
     } 
     CGContextStrokePath(UIGraphicsGetCurrentContext()); 
     CGContextFlush(UIGraphicsGetCurrentContext()); 
     drawImage.image = UIGraphicsGetImageFromCurrentImageContext(); 
     UIGraphicsEndImageContext(); 
    } 
} 

- (void)dealloc { 
    [drawImage release]; 
    [_drawingPenColor release]; 
    [super dealloc]; 
} 

@end

來源

2011-07-21 10:07:44 Dinakar

很酷......你能提供代碼嗎？ – Dev

我不知道它對你有多大幫助，但是你可以嘗試一下，如果一個人以緩慢的速度畫線，並且可以在我的代碼上使用更多的空間。 – Dinakar

真棒...這真的有幫助...會玩得更多...非常感謝。 – Dev

現在有一個叫做BrushEngine框架，你可以找到在http://www.cdframeworks.com/product/brushengine

BrushEngine讓您與借鑑你的手指使用線條，形狀（各種內置），自定義圖片和很多其他人。然後，您可以將輸出保存爲圖像或視頻。

來源

2013-07-01 22:29:28

有沒有可以在iOS上用觸摸畫線的SDK？

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