// UIColor+Hex.m创建继承于UIColor的类别 随机颜色
UIColor+Hex.h
+ (UIColor *)colorWithHexString:(NSString *)hexSting;
UIColor+Hex.m
// UIColorDemo
#import"UIColor+Hex.h"
#define RGBCOLOR(r,g,b) [UIColor colorWithRed:r/255.0green:g/255.0blue:b/255.0alpha:1]
@implementation UIColor (Hex)
+ (UIColor *)colorWithHexString:(NSString *)hexSting {
//修剪字符串去掉其中的特殊字符和空格
NSString *cString = [[hexSting stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
//#55DDBB 55->R DD->G BB->B长度小于6不符合要求
if([cStringlength] < 6) {
return[UIColor clearColor];
}
//如果是0X开头,那么从第二个字符开始剪切字符串
if([cString hasPrefix:@"0X"]) {
cString = [cString substringFromIndex:2];
}
//如果是以#开头,那么从第一个字符开始剪切字符串
if([cString hasPrefix:@"#"]) {
cString = [cString substringFromIndex:1];
}
//如果剪切到的字符串长度不是6也不符合要求
if([cString length] != 6) {
return[UIColor clearColor];
}
//0123456789ABCDEF字符集
//超出字符集不可使用
NSCharacterSet *hexSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789ABCDEF"];
NSRange range;
range.location= 0;
range.length= 2;
NSString *rString = [cString substringWithRange:range];
NSCharacterSet *rSet = [NSCharacterSet characterSetWithCharactersInString:rString];
range.location= 2;
NSString *gString = [cString substringWithRange:range];
NSCharacterSet *gSet = [NSCharacterSet characterSetWithCharactersInString:gString];
range.location= 4;
NSString *bString = [cString substringWithRange:range];
NSCharacterSet *bSet = [NSCharacterSet characterSetWithCharactersInString:bString];
if(![hexSetisSuper setOfSet:rSet] || ![hexSetisSuper setOfSet:gSet] || ![hexSetisSuper setOfSet:bSet]) {
return[UIColor clearColor];
}
unsigned int r,g,b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return RGBCOLOR(r, g, b);
}
