uiview
*theview = [[
uiview
alloc
] initwithframe
:self
.headerbackimgview
.frame];
[self
.headerview
addsubview
:theview];
//初始化
cagradientlayer
物件，使它的大小為
uiview
的大小
cagradientlayer
*gradientlayer = [
cagradientlayer
layer];
gradientlayer.
frame
= theview.
bounds;
//將cagradientlayer
物件新增在我們要設定背景色的檢視的
layer層
[theview.
layer
addsublayer
:gradientlayer];
//設定漸變區域的起始和終止位置（範圍為
0-1）
gradientlayer.
startpoint
= cgpointmake(0
, 0);
gradientlayer.
endpoint
= cgpointmake(1
, 1);
//設定顏色陣列
gradientlayer.
colors
= @[
(__bridge
id)[
uicolor
colorfromhexcode
:@"0488e5"
].cgcolor,
(__bridge
id)[
uicolor
colorfromhexcode
:@"#20bcf4"
].cgcolor];
//設定顏色分割點（範圍：
0-1）
gradientlayer.
locations
= @[@(0.0f)
, @(1.0f)]
;
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