工具类(为控件设置色值) - iOS

为了便于日常开发效率,因此创建了一些小的工具类便于使用.
具体 code 如下:
声明:

/*
    为控件设置色值
 */
#import <UIKit/UIKit.h>

@interface UIColor (FYH)

/**
 根据RGB颜色值生成UIColor
 @param rgbValue    颜色值
 @param alpha       透明度（0-1）之间
 @return            结果样式
 */
+ (UIColor *)colorFromRGB:(NSInteger)rgbValue withAlpha:(CGFloat)alpha;
+ (UIColor *)colorFromRGB:(NSInteger)rgbValue;

/**
 根据十六进制颜色值生成UIColor
 @param hexString   十六进制色值
 @return            结果样式
 */
+ (UIColor *)colorWithHexString:(NSString *)hexString;

/**
 根据十六进制颜色值生成UIColor
 @param hexString   十六进制色值
 @param alpha       透明度（0-1）之间
 @return            结果样式
 */
+ (UIColor *)colorWithHexString:(NSString *)hexString alpha:(CGFloat)alpha;
+ (UIColor *)colorWithHexStringWithAlpha:(NSString *)hexString;

@end

实现:

#import "UIColor+FYH.h"

@implementation UIColor (FYH)

+ (UIColor *)colorFromRGB:(NSInteger)rgbValue withAlpha:(CGFloat)alpha  {
    return [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16)) / 255.0
                           green:((float)((rgbValue & 0xFF00) >> 8)) / 255.0
                            blue:((float)(rgbValue & 0xFF)) / 255.0 alpha:alpha];

}

+ (UIColor *)colorFromRGB:(NSInteger)rgbValue {
    return [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16)) / 255.0
                           green:((float)((rgbValue & 0xFF00) >> 8)) / 255.0
                            blue:((float)(rgbValue & 0xFF)) / 255.0 alpha:1.0];

}

/**
 * hexString eg. #ff0000
 */
+ (UIColor *)colorWithHexString:(NSString *)hexString {
    return [UIColor colorWithHexString:hexString alpha:1.0];
}

/**
 * hexString eg. #ffffffff
 */
+ (UIColor *)colorWithHexStringWithAlpha:(NSString*)hexString {
    if ([hexString hasPrefix:@"0x"] || [hexString hasPrefix:@"0X"]) {
        hexString = [hexString substringFromIndex:2];
    } else if ([hexString hasPrefix:@"#"]) {
        hexString = [hexString substringFromIndex:1];
    }

    unsigned int value = 0;
    BOOL flag = [[NSScanner scannerWithString:hexString] scanHexInt:&value];
    if(NO == flag)
        return [UIColor clearColor];
    float r, g, b, a;
    a = (value & 0x000000FF) / 255.0;
    value = value >> 8;
    b = value & 0x000000FF;
    value = value >> 8;
    g = value & 0x000000FF;
    value = value >> 8;
    r = value;

    return [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a];
}

+ (UIColor *)colorWithHexString:(NSString *)hexString alpha:(CGFloat)alpha {
    if ([hexString hasPrefix:@"0x"] || [hexString hasPrefix:@"0X"]) {
        hexString = [hexString substringFromIndex:2];
    } else if ([hexString hasPrefix:@"#"]) {
        hexString = [hexString substringFromIndex:1];
    }

    unsigned int value = 0;
    BOOL flag = [[NSScanner scannerWithString:hexString] scanHexInt:&value];
    if(NO == flag)
        return [UIColor clearColor];
    float r, g, b, a;
    a = alpha;
    b = value & 0x0000FF;
    value = value >> 8;
    g = value & 0x0000FF;
    value = value >> 8;
    r = value;

    return [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a];
}

@end

以上便是此次分享的内容,期待大神多多指点补充,使其更加强壮!