IOS开发之——颜色设置

颜色设置:


指定RGB,參数是:红、绿、黄、透明度,范围是0-1

+ (UIColor *)colorWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha;

指定HSB,參数是:色调(hue),饱和的(saturation),亮度(brightness)

+ (UIColor *)colorWithHue:(CGFloat)hue saturation:(CGFloat)saturation brightness:(CGFloat)brightness alpha:(CGFloat)alpha;

当前的颜色改变透明度后的颜色:

UIColor *color = [UIColor redColor];
UIColor *cl = [color colorWithAlphaComponent:0.5f];


自己定义255的颜色值,将255转成0-1

CGFloat R  = (CGFloat) 225/255.0;
CGFloat G = (CGFloat) 66/255.0;
CGFloat B = (CGFloat) 88/255.0;
CGFloat alpha = (CGFloat) 1.0;
    
UIColor *myColorRGB = [ UIColor colorWithRed: R  green: G  blue: B  alpha: alpha  ];
self.tableView.backgroundColor = myColorRGB;


最后附上

UIColor官方API文档:

Creating a UIColor Object from Component Values

Initializing a UIColor Object

Creating a UIColor with Preset Component Values


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