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core graphic not drawing gradient color in cliped rect
How do I draw a shadow under a UIView?Core Data: Quickest way to delete all instances of an entityMultiple Clipped Rects to Create Collage in Core GraphicsDrawing a color map with Core GraphicsCore Graphics - drawing a line at an angleIssue Creating and Masking a Solid Color CGImageDraw outline with core-graphicsDraw bullet arrow in Core GraphicsDrawing a triangle in Core GraphicsTriangle Gradient With Core Graphics
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
this pieces of code won't work, i don't know why.
just create a trangle and clip then draw gradient
// create contect and save
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
// create path
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 20, rect.size.height - 20);
CGPathAddLineToPoint(path, NULL, rect.size.width / 2, 20);
CGPathAddLineToPoint(path, NULL, rect.size.width - 20, rect.size.height - 20);
CGPathCloseSubpath(path);
CGContextAddPath(context, path);
CGContextClip(context);
// create gradient
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSArray *colorArr = @[
(id)[UIColor blackColor],
(id)[UIColor whiteColor],
];
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colorArr, NULL);
// rlease gradinet
CGContextDrawLinearGradient(context, gradient, CGPointMake(rect.size.width / 2,rect.size.height - 20), CGPointMake(rect.size.width / 2, 20), 0);
// restore context
CGContextRestoreGState(context);
objective-c
asked Mar 28 at 8:03
KiraKira
42 bronze badges
add a comment |
this pieces of code won't work, i don't know why.
just create a trangle and clip then draw gradient
// create contect and save
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
// create path
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 20, rect.size.height - 20);
CGPathAddLineToPoint(path, NULL, rect.size.width / 2, 20);
CGPathAddLineToPoint(path, NULL, rect.size.width - 20, rect.size.height - 20);
CGPathCloseSubpath(path);
CGContextAddPath(context, path);
CGContextClip(context);
// create gradient
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSArray *colorArr = @[
(id)[UIColor blackColor],
(id)[UIColor whiteColor],
];
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colorArr, NULL);
// rlease gradinet
CGContextDrawLinearGradient(context, gradient, CGPointMake(rect.size.width / 2,rect.size.height - 20), CGPointMake(rect.size.width / 2, 20), 0);
// restore context
CGContextRestoreGState(context);
objective-c
asked Mar 28 at 8:03
KiraKira
42 bronze badges
add a comment |
this pieces of code won't work, i don't know why.
just create a trangle and clip then draw gradient
// create contect and save
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
// create path
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 20, rect.size.height - 20);
CGPathAddLineToPoint(path, NULL, rect.size.width / 2, 20);
CGPathAddLineToPoint(path, NULL, rect.size.width - 20, rect.size.height - 20);
CGPathCloseSubpath(path);
CGContextAddPath(context, path);
CGContextClip(context);
// create gradient
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSArray *colorArr = @[
(id)[UIColor blackColor],
(id)[UIColor whiteColor],
];
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colorArr, NULL);
// rlease gradinet
CGContextDrawLinearGradient(context, gradient, CGPointMake(rect.size.width / 2,rect.size.height - 20), CGPointMake(rect.size.width / 2, 20), 0);
// restore context
CGContextRestoreGState(context);
objective-c
asked Mar 28 at 8:03
KiraKira
42 bronze badges
this pieces of code won't work, i don't know why.
just create a trangle and clip then draw gradient
// create contect and save
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
// create path
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 20, rect.size.height - 20);
CGPathAddLineToPoint(path, NULL, rect.size.width / 2, 20);
CGPathAddLineToPoint(path, NULL, rect.size.width - 20, rect.size.height - 20);
CGPathCloseSubpath(path);
CGContextAddPath(context, path);
CGContextClip(context);
// create gradient
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSArray *colorArr = @[
(id)[UIColor blackColor],
(id)[UIColor whiteColor],
];
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colorArr, NULL);
// rlease gradinet
CGContextDrawLinearGradient(context, gradient, CGPointMake(rect.size.width / 2,rect.size.height - 20), CGPointMake(rect.size.width / 2, 20), 0);
// restore context
CGContextRestoreGState(context);
objective-c
objective-c
asked Mar 28 at 8:03
KiraKira
42 bronze badges
asked Mar 28 at 8:03
KiraKira
42 bronze badges
asked Mar 28 at 8:03
KiraKira
42 bronze badges
asked Mar 28 at 8:03
KiraKira
42 bronze badges
asked Mar 28 at 8:03
KiraKira
42 bronze badges
42 bronze badges
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
After upload this question, i find my error, the color should be CGColor,
like this [UIColor redColor].cgColor.
answered Mar 28 at 8:06
KiraKira
42 bronze badges
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
After upload this question, i find my error, the color should be CGColor,
like this [UIColor redColor].cgColor.
answered Mar 28 at 8:06
KiraKira
42 bronze badges
add a comment |
After upload this question, i find my error, the color should be CGColor,
like this [UIColor redColor].cgColor.
answered Mar 28 at 8:06
KiraKira
42 bronze badges
add a comment |
After upload this question, i find my error, the color should be CGColor,
like this [UIColor redColor].cgColor.
answered Mar 28 at 8:06
KiraKira
42 bronze badges
After upload this question, i find my error, the color should be CGColor,
like this [UIColor redColor].cgColor.
answered Mar 28 at 8:06
KiraKira
42 bronze badges
answered Mar 28 at 8:06
KiraKira
42 bronze badges
answered Mar 28 at 8:06
KiraKira
42 bronze badges
answered Mar 28 at 8:06
KiraKira
42 bronze badges
42 bronze badges
add a comment |
add a comment |
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