顏色設置：

指定RGB，參數是：紅、綠、黃、透明度，范圍是0-1

+ (UIColor *)colorWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha;
指定HSB，參數是：色調（hue），飽和的（saturation），亮度（brightness）

+ (UIColor *)colorWithHue:(CGFloat)hue saturation:(CGFloat)saturation brightness:(CGFloat)brightness alpha:(CGFloat)alpha;
當前的顏色改變透明度后的顏色：

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

自己定義255的顏色值，將255轉成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文檔：

Creating a UIColor Object from Component Values

• +?colorWithWhite:alpha:
• +?colorWithHue:saturation:brightness:alpha:
• +?colorWithRed:green:blue:alpha:
• +?colorWithCGColor:
• +?colorWithPatternImage:
• +?colorWithCIColor:
• –?colorWithAlphaComponent:

Initializing a UIColor Object

• –?initWithWhite:alpha:
• –?initWithHue:saturation:brightness:alpha:
• –?initWithRed:green:blue:alpha:
• –?initWithCGColor:
• –?initWithPatternImage:
• –?initWithCIColor:

Creating a UIColor with Preset Component Values

• +?blackColor
• +?darkGrayColor
• +?lightGrayColor
• +?whiteColor
• +?grayColor
• +?redColor
• +?greenColor
• +?blueColor
• +?cyanColor
• +?yellowColor
• +?magentaColor
• +?orangeColor
• +?purpleColor
• +?brownColor
• +?clearColor

總結

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