Iphone 捕获UIView的UIImage卡在DrawRect方法中

我试图捕获UIView的图像，但当我调用此方法时

- (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContext(view.bounds.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return img;
}

我的应用程序输入视图的DrawRect方法，并卡在这些行的循环中

[super drawRect:rect];
[curImage drawAtPoint:CGPointMake(0, 0)];
mid1 = midPoint(previousPoint1, previousPoint2);
mid2 = midPoint(currentPoint, previousPoint1);

context = UIGraphicsGetCurrentContext();

[self.layer renderInContext:context];

这是我的

drawRect

方法

- (void)drawRect:(CGRect)rect
{

    [super drawRect:rect];
    [curImage drawAtPoint:CGPointMake(0, 0)];
    mid1 = midPoint(previousPoint1, previousPoint2);
    mid2 = midPoint(currentPoint, previousPoint1);

    context = UIGraphicsGetCurrentContext();

    [self.layer renderInContext:context];

    CGContextMoveToPoint(context, mid1.x, mid1.y);
    CGContextAddQuadCurveToPoint(context, previousPoint1.x, previousPoint1.y, mid2.x, mid2.y);

    CGContextSetLineCap(context, kCGLineCapRound);
    CGContextSetLineWidth(context, self.lineWidth);
    CGContextSetStrokeColorWithColor(context, self.lineColor.CGColor);

    CGContextStrokePath(context);
}

---

要捕获UIView图像，只需运行以下行并选中：

    CGRect screenRect = [[UIScreen mainScreen] bounds];
    UIGraphicsBeginImageContextWithOptions(screenRect.size, NO, 0.0);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

---

您还可以将图像保存在文档目录中并捕获UIView图像

 UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *saveImage = UIGraphicsGetImageFromCurrentImageContext();
//inserttrue=TRUE;
UIGraphicsEndImageContext();
imagdata = UIImagePNGRepresentation(saveImage);
NSFileManager *fileMan = [NSFileManager defaultManager];
[self.view setContentStretch:CGRectMake(0, 0, 320, 480)];
NSString *fileName = [NSString stringWithFormat:@"%@.png",@"XYZ"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];

[fileMan createFileAtPath:pdfFileName contents:imagdata attributes:nil];

---

是否调用了drow rect方法？@NitinGohel thanx以获取答复。DrawRect正在一次又一次地调用infect。现在vishal解决了我的问题Thanx:）Thanx也给你…享受。vishal它正在工作，但它一次又一次地调用我的SignatureView的drawRect方法。它被困在一个永远不会结束的循环中，您对drawRect方法做了什么？这意味着您为什么调用drawRect方法？