iOS繪圖之畫一個漸變的Border

- (void) drawRect:(CGRect)rect { CGFloat colors [] = { 1.0, 0.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 1.0,

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