UIView con rettangolo arrotondato e ombra esterna: l'ombra appare sopra il rettangolo

Question

Ho una sottoclasse uiview in cui sto cercando di disegnare un rettangolo arrotondato con un'ombra esterna. Sebbene disegna entrambi gli elementi, posso vedere l'ombra attraverso il riempimento arrotondato del rettangolo. Sono nuovo di CG quindi probabilmente mi manca qualcosa di semplice (anche se non sembra essere l'alfa del riempimento che è impostato su 1). Ecco il codice rect draw.

- (void)drawRect:(CGRect)rect { 
    // get the contect 
CGContextRef context = UIGraphicsGetCurrentContext(); 

//for the shadow, save the state then draw the shadow 
CGContextSaveGState(context); 
    CGContextSetShadow(context, CGSizeMake(4,-5), 10); 



//now draw the rounded rectangle 
CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); 
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0); 

//since I need room in my rect for the shadow, make the rounded rectangle a little smaller than frame 
CGRect rrect = CGRectMake(CGRectGetMinX(rect), CGRectGetMinY(rect), CGRectGetWidth(rect)-30, CGRectGetHeight(rect)-30); 
CGFloat radius = self.cornerRadius; 
// the rest is pretty much copied from Apples example 
CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect); 
CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect); 

// Start at 1 
CGContextMoveToPoint(context, minx, midy); 
// Add an arc through 2 to 3 
CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); 
// Add an arc through 4 to 5 
CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); 
// Add an arc through 6 to 7 
CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); 
// Add an arc through 8 to 9 
CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); 
// Close the path 
CGContextClosePath(context); 
// Fill & stroke the path 
CGContextDrawPath(context, kCGPathFillStroke); 

//for the shadow 
    CGContextRestoreGState(context); 
} 

Answer 1

Non penso di poterlo fare in un solo passaggio. Hmm Ho cambiato il tuo codice come segue, che sembra funzionare.

- (void)drawRect:(CGRect)rect 
{ 
    // get the contect 
    CGContextRef context = UIGraphicsGetCurrentContext(); 

    //now draw the rounded rectangle 
    CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); 
    CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 0.0); 

    //since I need room in my rect for the shadow, make the rounded rectangle a little smaller than frame 
    CGRect rrect = CGRectMake(CGRectGetMinX(rect), CGRectGetMinY(rect), CGRectGetWidth(rect)-30, CGRectGetHeight(rect)-30); 
    CGFloat radius = 45; 
    // the rest is pretty much copied from Apples example 
    CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect); 
    CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect); 

    { 
     //for the shadow, save the state then draw the shadow 
     CGContextSaveGState(context); 

     // Start at 1 
     CGContextMoveToPoint(context, minx, midy); 
     // Add an arc through 2 to 3 
     CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); 
     // Add an arc through 4 to 5 
     CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); 
     // Add an arc through 6 to 7 
     CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); 
     // Add an arc through 8 to 9 
     CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); 
     // Close the path 
     CGContextClosePath(context); 

     CGContextSetShadow(context, CGSizeMake(4,-5), 10); 
     CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); 

     // Fill & stroke the path 
     CGContextDrawPath(context, kCGPathFillStroke); 

     //for the shadow 
     CGContextRestoreGState(context); 
    } 

    { 
     // Start at 1 
     CGContextMoveToPoint(context, minx, midy); 
     // Add an arc through 2 to 3 
     CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); 
     // Add an arc through 4 to 5 
     CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); 
     // Add an arc through 6 to 7 
     CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); 
     // Add an arc through 8 to 9 
     CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); 
     // Close the path 
     CGContextClosePath(context); 

     CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); 
     CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);  

     // Fill & stroke the path 
     CGContextDrawPath(context, kCGPathFillStroke); 
    } 
} 

Answer 2

provare questo dopo aver importato QuartzCore/QuartzCore.h

yourView.layer.shadowColor = [[UIColor blackColor] CGColor]; 
yourView.layer.shadowOffset = CGSizeMake(10.0f, 10.0f); 
yourView.layer.shadowOpacity = 1.0f; 
yourView.layer.shadowRadius = 10.0f; 

Answer 3

- (void)drawRect:(CGRect)rect 
{ 
    self.layer.masksToBounds = NO; 
    self.layer.shadowColor = [[UIColor whiteColor] CGColor]; 
    self.layer.shadowOffset = CGSizeMake(0,2); 
    self.layer.shadowRadius = 2; 
    self.layer.shadowOpacity = 0.2; 

    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(20, 20)]; 
    [[UIColor blackColor] setFill]; 

    [path fill]; 
}