UIColor colorWithWhite alpha example objc

[UIColor  colorWithWhite alpha]

Creates and returns a color object using the specified opacity and grayscale values.

+ (UIColor *)colorWithWhite:(CGFloat)white alpha:(CGFloat)alpha

Parameters of [UIColor  colorWithWhite alpha] 

white

The grayscale value of the color object, specified as a value from 0.0 to 1.0.

alpha

The opacity value of the color object, specified as a value from 0.0 to 1.0.

Return Value of [UIColor  colorWithWhite alpha] 

The color object. The color information represented by this object is in the device gray colorspace.

Discussion 

Values below 0.0 are interpreted as 0.0, and values above 1.0 are interpreted as 1.0.

Example of [UIColor  colorWithWhite alpha]
{
    //...

    UIColor     *colorForSortOff = [UIColor colorWithWhite:0.5f alpha:1.0f];

    

    //...

}

UIColor colorWithRed:green:blue:alpha: example objc

[UIColor  colorWithRed green blue alpha]

Creates and returns a color object using the specified opacity and RGB component values.

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

Parameters of [UIColor  colorWithRed green blue alpha]

red

The red component of the color object, specified as a value from 0.0 to 1.0.

green

The green component of the color object, specified as a value from 0.0 to 1.0.

blue

The blue component of the color object, specified as a value from 0.0 to 1.0.

alpha

The opacity value of the color object, specified as a value from 0.0 to 1.0.

Return Value of [UIColor  colorWithRed green blue alpha]

The color object. The color information represented by this object is in the device RGB colorspace.

Discussion

Values below 0.0 are interpreted as 0.0, and values above 1.0 are interpreted as 1.0.

Example of [UIColor  colorWithRed green blue alpha]

{
...

    UIColor   *colorForCategoryTextMemo = [UIColor colorWithRed:98.0f/255.0f green:151.0f/255.0f blue:81.0f/255.0f alpha:1.0f];

    UIColor   *colorForCategoryBookmark = [UIColor colorWithRed:233.0f/255.0f green:185.0f/255.0f blue:58.0f/255.0f alpha:1.0f];

    UIColor   *colorForCategoryImage = [UIColor colorWithRed:232.0f/255.0f green:127.0f/255.0f blue:79.0f/255.0f alpha:1.0f];

}