為了便于日常開發(fā)效率,因此創(chuàng)建了一些小的工具類便于使用.
具體 code 如下:
聲明:

/*
    為控件設(shè)置色值
 */
#import <UIKit/UIKit.h>

@interface UIColor (FYH)


/**
 根據(jù)RGB顏色值生成UIColor

 @param rgbValue    顏色值
 @param alpha       透明度（0-1）之間
 @return            結(jié)果樣式
 */
+ (UIColor *)colorFromRGB:(NSInteger)rgbValue withAlpha:(CGFloat)alpha;
+ (UIColor *)colorFromRGB:(NSInteger)rgbValue;



/**
 根據(jù)十六進(jìn)制顏色值生成UIColor

 @param hexString   十六進(jìn)制色值
 @return            結(jié)果樣式
 */
+ (UIColor *)colorWithHexString:(NSString *)hexString;



/**
 根據(jù)十六進(jìn)制顏色值生成UIColor

 @param hexString   十六進(jìn)制色值
 @param alpha       透明度（0-1）之間
 @return            結(jié)果樣式
 */
+ (UIColor *)colorWithHexString:(NSString *)hexString alpha:(CGFloat)alpha;
+ (UIColor *)colorWithHexStringWithAlpha:(NSString *)hexString;

@end

實(shí)現(xiàn):

#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內(nèi)容,期待大神多多指點(diǎn)補(bǔ)充,使其更加強(qiáng)壯!