2019独角兽企业重金招聘Python工程师标准>>> 
手写，我们需要使用类别Category构建一个新类
UIColor +UIHexColor.h
@interface UIColor (UIHexColor)
/***
** 将hex解析为颜色
**/
+(UIColor *) colorWithHexString: (NSString *) stringToConvert;
/***
** 实现颜色反解析
**/
+(NSString *) changeUIColorToRGB:(UIColor *)color;
/***
** 通过名称设置颜色
**/
+(UIColor *) colorNameToUIColor:(NSString *) name;
@endUIColor +UIHexColor.mm
//
// UIColor+UIColorHex.m
// DyTest
//
// Created by zhangnan on 13-11-6.
// Copyright (c) 2013年 zhangnan. All rights reserved.
//
#import "UIColor+UIHexColor.h"
@implementation UIColor (UIHexColor)
+ (UIColor *) colorWithHexString: (NSString *) hexString{
NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] lowercaseString];
UIColor * nameForColor = [UIColor colorNameToUIColor:cString];
if(nameForColor!=nil)
{
return nameForColor;
}
// 字符串必须最小6个字符
if ([cString length] < 3) return [UIColor clearColor];
if ([cString hasPrefix:@"0x"]) cString = [cString substringFromIndex:2];
if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];
if(![UIColor valideColorStrFormat:cString])
{
return [UIColor clearColor];
}
if([cString length]==3)
{
NSArray * colorSplits = [cString componentsSeparatedByString:@""];
if(colorSplits.count==3)
{
cString = @"";
for (NSString * item in colorSplits) {
cString = [cString stringByAppendingFormat:@"%@%@",item,item];
}
}
}
if ([cString length] == 6)
{// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;
NSString *rString = [cString substringWithRange:range];
range.location = 2;
NSString *gString = [cString substringWithRange:range];
range.location = 4;
NSString *bString = [cString substringWithRange:range];
// Scan values
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f)
green:((float) g / 255.0f)
blue:((float) b / 255.0f)
alpha:1.0f];
}
else if ([cString length] == 8)
{
NSRange range;
range.location = 0;
range.length = 2;
NSString *aString = [cString substringWithRange:range];
range.location = 2;
NSString *rString = [cString substringWithRange:range];
range.location = 4;
NSString *gString = [cString substringWithRange:range];
range.location = 6;
NSString *bString = [cString substringWithRange:range];
// Scan values
unsigned int a, r, g, b;
[[NSScanner scannerWithString:aString] scanHexInt:&a];
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f)
green:((float) g / 255.0f)
blue:((float) b / 255.0f)
alpha:((float) a / 255.0f)];
}
else
{
return [UIColor clearColor];
}
}
/**
*
* 通过颜色名称读取Color
*/
+(UIColor *) colorNameToUIColor:(NSString *) name
{
if(name==nil || name.length==0)
{
return nil;
}
name = [name lowercaseString];
NSDictionary * COLOR_DICT = @{ @"transparent":[UIColor colorWithRed:0 green:0 blue:0 alpha:0],
@"black":[UIColor blackColor],
@"white":[UIColor whiteColor],
@"gray":[UIColor grayColor],
@"green":[UIColor greenColor],
@"blue":[UIColor blueColor],
@"cyan":[UIColor cyanColor],
@"yellow":[UIColor yellowColor],
@"magenta":[UIColor magentaColor],
@"orange":[UIColor orangeColor],
@"purple":[UIColor purpleColor],
@"brown":[UIColor brownColor]
};
if([COLOR_DICT.allKeys containsObject:name])
{
return COLOR_DICT[name];
}
return nil;
}
/**
** 颜色值校验
**/
+(BOOL) valideColorStrFormat:(NSString *) source
{
if(source==nil || source.length==0)
{
return NO;
}
if(source.length!=3 && source.length!=6 && source.length!=8)
{
return NO;
}
NSError * error;
NSString * strNumberRegExp = @"^(([\\da-fA-F]{3}){1,2}|([\\da-fA-F]{8}))$";
NSRegularExpression * regExp = [NSRegularExpression regularExpressionWithPattern:strNumberRegExp options:NSRegularExpressionDotMatchesLineSeparators|NSRegularExpressionCaseInsensitive error:&error];
NSArray * matchResults = [regExp matchesInString:source options:NSMatchingReportCompletion range:NSMakeRange(0, source.length)];
if(matchResults!=nil && matchResults.count==1)
{
NSRange range = [matchResults[0] range];
return [source isEqualToString:[source substringWithRange:range]];
}
return NO;
}
//颜色转字符串
+(NSString *) changeUIColorToRGB:(UIColor *)color{
const CGFloat *cs=CGColorGetComponents(color.CGColor);
NSString *r = [NSString stringWithFormat:@"%@",[self ToHex:cs[0]*255]];
NSString *g = [NSString stringWithFormat:@"%@",[self ToHex:cs[1]*255]];
NSString *b = [NSString stringWithFormat:@"%@",[self ToHex:cs[2]*255]];
return [NSString stringWithFormat:@"#%@%@%@",r,g,b];
}
//十进制转十六进制
+(NSString *)ToHex:(int)tmpid
{
NSString *endtmp=@"";
NSString *nLetterValue;
NSString *nStrat;
int ttmpig=tmpid%16;
int tmp=tmpid/16;
switch (ttmpig)
{
case 10:
nLetterValue =@"A";break;
case 11:
nLetterValue =@"B";break;
case 12:
nLetterValue =@"C";break;
case 13:
nLetterValue =@"D";break;
case 14:
nLetterValue =@"E";break;
case 15:
nLetterValue =@"F";break;
default:nLetterValue=[[NSString alloc]initWithFormat:@"%i",ttmpig];
}
switch (tmp)
{
case 10:
nStrat =@"A";break;
case 11:
nStrat =@"B";break;
case 12:
nStrat =@"C";break;
case 13:
nStrat =@"D";break;
case 14:
nStrat =@"E";break;
case 15:
nStrat =@"F";break;
default:nStrat=[[NSString alloc]initWithFormat:@"%i",tmp];
}
endtmp=[[NSString alloc]initWithFormat:@"%@%@",nStrat,nLetterValue];
return endtmp;
}
@end