How is CALayer.shadowOffset set from CGSize?
If I do view.layer.shadowOffset = CGSize(width: -1, height: 1) what exactly does the numbers -1 for width, and 1 for height mean? How is the shadow determined from the CGSize passed? I found the documentation, but it's not very useful
swift cgsize
asked Nov 21 '18 at 10:30
matchifang
96521333
add a comment |
If I do view.layer.shadowOffset = CGSize(width: -1, height: 1) what exactly does the numbers -1 for width, and 1 for height mean? How is the shadow determined from the CGSize passed? I found the documentation, but it's not very useful
swift cgsize
asked Nov 21 '18 at 10:30
matchifang
96521333
It means one point difference from the current frame. Negative/positive on width should be used to set either it's the shadow needs a translation to left/right. Negative/positive on height should be used to set either it's the shadow needs a translation to top/bottom. I'd suggest to create 4 views, apply a shadow on them of "w:0,h:4", "w:0,h-4", "w:4,h:0", "w-4:h:0" to illustrate it.
– Larme
Nov 21 '18 at 10:36
add a comment |
If I do view.layer.shadowOffset = CGSize(width: -1, height: 1) what exactly does the numbers -1 for width, and 1 for height mean? How is the shadow determined from the CGSize passed? I found the documentation, but it's not very useful
swift cgsize
asked Nov 21 '18 at 10:30
matchifang
96521333
If I do view.layer.shadowOffset = CGSize(width: -1, height: 1) what exactly does the numbers -1 for width, and 1 for height mean? How is the shadow determined from the CGSize passed? I found the documentation, but it's not very useful
swift cgsize
swift cgsize
asked Nov 21 '18 at 10:30
matchifang
96521333
asked Nov 21 '18 at 10:30
matchifang
96521333
asked Nov 21 '18 at 10:30
matchifang
96521333
asked Nov 21 '18 at 10:30
matchifang
96521333
asked Nov 21 '18 at 10:30
matchifang
96521333
96521333
It means one point difference from the current frame. Negative/positive on width should be used to set either it's the shadow needs a translation to left/right. Negative/positive on height should be used to set either it's the shadow needs a translation to top/bottom. I'd suggest to create 4 views, apply a shadow on them of "w:0,h:4", "w:0,h-4", "w:4,h:0", "w-4:h:0" to illustrate it.
– Larme
Nov 21 '18 at 10:36
add a comment |
It means one point difference from the current frame. Negative/positive on width should be used to set either it's the shadow needs a translation to left/right. Negative/positive on height should be used to set either it's the shadow needs a translation to top/bottom. I'd suggest to create 4 views, apply a shadow on them of "w:0,h:4", "w:0,h-4", "w:4,h:0", "w-4:h:0" to illustrate it.
– Larme
Nov 21 '18 at 10:36
It means one point difference from the current frame. Negative/positive on width should be used to set either it's the shadow needs a translation to left/right. Negative/positive on height should be used to set either it's the shadow needs a translation to top/bottom. I'd suggest to create 4 views, apply a shadow on them of "w:0,h:4", "w:0,h-4", "w:4,h:0", "w-4:h:0" to illustrate it.
– Larme
Nov 21 '18 at 10:36
It means one point difference from the current frame. Negative/positive on width should be used to set either it's the shadow needs a translation to left/right. Negative/positive on height should be used to set either it's the shadow needs a translation to top/bottom. I'd suggest to create 4 views, apply a shadow on them of "w:0,h:4", "w:0,h-4", "w:4,h:0", "w-4:h:0" to illustrate it.
– Larme
Nov 21 '18 at 10:36
add a comment |
1 Answer
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Consider width and height as x and y. And you should be aware in iOS coordinates start from top left.
CGSize(width: -1, height: 1) means that the shadow will move 1 point to the left on x-axis and 1 point up on y-axis.
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
answered Nov 21 '18 at 10:42
DionizB
1,0281314
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
active
oldest
votes
Consider width and height as x and y. And you should be aware in iOS coordinates start from top left.
CGSize(width: -1, height: 1) means that the shadow will move 1 point to the left on x-axis and 1 point up on y-axis.
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
answered Nov 21 '18 at 10:42
DionizB
1,0281314
add a comment |
Consider width and height as x and y. And you should be aware in iOS coordinates start from top left.
CGSize(width: -1, height: 1) means that the shadow will move 1 point to the left on x-axis and 1 point up on y-axis.
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
answered Nov 21 '18 at 10:42
DionizB
1,0281314
add a comment |
Consider width and height as x and y. And you should be aware in iOS coordinates start from top left.
CGSize(width: -1, height: 1) means that the shadow will move 1 point to the left on x-axis and 1 point up on y-axis.
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
answered Nov 21 '18 at 10:42
DionizB
1,0281314
Consider width and height as x and y. And you should be aware in iOS coordinates start from top left.
CGSize(width: -1, height: 1) means that the shadow will move 1 point to the left on x-axis and 1 point up on y-axis.
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
answered Nov 21 '18 at 10:42
DionizB
1,0281314
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
edited Nov 21 '18 at 11:15
Kristjan Kica
2,0721926
2,0721926
answered Nov 21 '18 at 10:42
DionizB
1,0281314
answered Nov 21 '18 at 10:42
DionizB
1,0281314
answered Nov 21 '18 at 10:42
DionizB
1,0281314
1,0281314
add a comment |
add a comment |
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It means one point difference from the current frame. Negative/positive on width should be used to set either it's the shadow needs a translation to left/right. Negative/positive on height should be used to set either it's the shadow needs a translation to top/bottom. I'd suggest to create 4 views, apply a shadow on them of "w:0,h:4", "w:0,h-4", "w:4,h:0", "w-4:h:0" to illustrate it.
– Larme
Nov 21 '18 at 10:36