Swift中的UIColor使用（随机颜色、自定义颜色）

https://github.com/potato512/SYSwiftLearning

swift中使用UIColor时，除了使用系统自带的颜色外，还可以自定义随机颜色，或按照指定颜色值&透明度进行设置颜色。

效果图：

源代码：

/// 设置随机颜色
class func UIColorRandom() -> UIColor
{
        let color: UIColor = UIColor.init(red: (((CGFloat)((random() % 256)) / 255.0)), green: (((CGFloat)((random() % 256)) / 255.0)), blue: (((CGFloat)((random() % 256)) / 255.0)), alpha: 1.0);
        return color;
}    

/// 设置颜色（RGB：0.0~255.0） 示例：UIColorRGB(100, 100, 100)
class func UIColorRGB(R:CGFloat, G:CGFloat, B:CGFloat) -> UIColor
{
        return UIColorRGB_Alpha(R, G: G, B: B, alpha: 1.0);
}    

/// 设置颜色与透明度（RGB：0.0~255.0；alpha：0.0~1.0） 示例：UIColorRGB_Alpha(100.0, 100.0, 20.0, 1.0)
class func UIColorRGB_Alpha(R:CGFloat, G:CGFloat, B:CGFloat, alpha:CGFloat) -> UIColor
{
        let color = UIColor.init(red: (R / 255.0), green: (G / 255.0), blue: (B / 255.0), alpha: alpha);
        return color;
}

/// 设置颜色 示例：UIColorHex(0x26A7E8)
class func UIColorHex(value:UInt32) -> UIColor
{
        return UIColorHex_Alpha(value, alpha: 1.0);
}

/// 设置颜色与透明度 示例：UIColorHEX_Alpha(0x26A7E8, 0.5)
class func UIColorHex_Alpha(value:UInt32, alpha:CGFloat) -> UIColor
{
        let color = UIColor.init(red: (((CGFloat)((value & 0xFF0000) >> 16)) / 255.0), green: (((CGFloat)((value & 0xFF0000) >> 16)) / 255.0), blue: (((CGFloat)((value & 0xFF0000) >> 16)) / 255.0), alpha: alpha)
        return color
}

代码使用示例：

let randomView = UIView.init(frame: CGRectMake(10.0, 80.0, 60.0, 20.0))
self.view.addSubview(randomView);
randomView.backgroundColor = UIColorTools.UIColorRandom()

let hexAlphaView = UIView.init(frame: CGRectMake(10.0, 120.0, 60.0, 60.0))
self.view.addSubview(hexAlphaView);
hexAlphaView.backgroundColor = UIColorTools.UIColorHex_Alpha(0xadaddf, alpha: 0.3)

let hexView = UIView.init(frame: CGRectMake(80.0, 120.0, 60.0, 60.0))
self.view.addSubview(hexView);
hexView.backgroundColor = UIColorTools.UIColorHex(0x663215)

let rgbAlphaView = UIView.init(frame: CGRectMake(10.0, 200.0, 30.0, 30.0))
self.view.addSubview(rgbAlphaView);
rgbAlphaView.backgroundColor = UIColorTools.UIColorRGB_Alpha(200.0, G: 230.0, B: 25.0, alpha: 0.5);

let rgbView = UIView.init(frame: CGRectMake(50.0, 200.0, 30.0, 30.0))
self.view.addSubview(rgbView);
rgbView.backgroundColor = UIColorTools.UIColorRGB(20.0, G: 15.3, B: 55.0)