swift - NSAttributedString Shadow and Stroke on iOS? -


when use stroke , shadow, sort of double-stroke. how can fix this?

playground code:

import uikit  var shadow = nsshadow() shadow.shadowcolor = uicolor.black shadow.shadowoffset = cgsize(width: 0, height: 3)  class customlabel: uilabel {     override func drawtext(in rect: cgrect) {         let attributes: [string: any] = [nsstrokewidthattributename: -2.0,                           nsstrokecolorattributename: uicolor.black,                           nsforegroundcolorattributename: uicolor.white,                           nsshadowattributename: shadow,                           nsfontattributename: uifont(name: "avenirnext-bold", size: 50)]         self.attributedtext = nsattributedstring(string: self.text ?? "", attributes: attributes)         super.drawtext(in: rect)     } }  let label = customlabel(frame: cgrect(x: 0, y: 0, width: 200, height: 100)) label.backgroundcolor = uicolor.orange label.text = "hello"

result:

enter image description here

i figured out. if apply shadow label's calayer, , disable background-color, works expected:

import uikit  class customlabel: uilabel {      required init?(coder adecoder: nscoder) {         super.init(coder: adecoder)     }      override init(frame: cgrect) {         super.init(frame: frame)         self.layer.shadowcolor = uicolor.black.cgcolor         self.layer.shadowoffset = cgsize(width: 0, height: 3)         self.layer.shadowopacity = 1.0         self.layer.shadowradius = 0.0     }      override func drawtext(in rect: cgrect) {         let attributes: [string: any] = [nsstrokewidthattributename: -2.0,                                          nsstrokecolorattributename: uicolor.black,                                          nsforegroundcolorattributename: uicolor.white,                                          nsfontattributename: uifont(name: "avenirnext-bold", size: 50)]         self.attributedtext = nsattributedstring(string: self.text ?? "", attributes: attributes)         super.drawtext(in: rect)     } }  let label = customlabel(frame: cgrect(x: 0, y: 0, width: 200, height: 100)) label.text = "hello"

enter image description here


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