对关键字着色

http://www.cnblogs.com/wupei/p/4019963.html

/**

*  对指定内定进行着色，keywords数组与colors数组相对应

*

*  @param content  全部内容

*  @param keyWords 关键字数组

*  @param color    关键字对应颜色，如果传空，则默认对关键字着红色

*  @param repeat   关键字出现多次的时候，是否全部进行多次着色,默认否

*

*  @return

*/

+(NSAttributedString*)attributeStringWithContent:(NSString*)content keyWords:(NSArray*)keyWords colors:(NSArray*)colors repeat:(BOOL)repeat;

+(NSAttributedString*)attributeStringWithContent:(NSString*)content keyWords:(NSArray*)keyWords colors:(NSArray*)colors repeat:(BOOL)repeat

{

NSMutableAttributedString*attString = [[NSMutableAttributedStringalloc] initWithString:content];

if(keyWords) {

[keyWords enumerateObjectsUsingBlock:^(idobj,NSUIntegeridx,BOOL*stop) {

NSMutableString*tmpString=[NSMutableStringstringWithString:content];

NSRangerange=[content rangeOfString:obj];

NSIntegerlocation=0;

while(range.length>0) {

UIColor *color=nil;

if(!colors[idx]) {

color=[UIColor redColor];

}else{

color=colors[idx];

}

[attString addAttribute:(NSString*)NSForegroundColorAttributeNamevalue:color range:NSMakeRange(location+range.location, range.length)];

location+=(range.location+range.length);

NSString*tmp= [tmpString substringWithRange:NSMakeRange(range.location+range.length, content.length-location)];

tmpString=[NSMutableStringstringWithString:tmp];

range=[tmp rangeOfString:obj];

if(!repeat) {

break;

}

}

}];

}

returnattString;

}

content是根据网址获得的网页源码字符串

- (NSString*)changeToString:(NSString*)content{NSRegularExpression*regularExpretion=[NSRegularExpressionregularExpressionWithPattern:@"<[^>]*>|\n"options:0error:nil];        content = [regularExpretion stringByReplacingMatchesInString:content options:NSMatchingReportProgressrange:NSMakeRange(0, content.length) withTemplate:@"-"];//  替换所有html和换行匹配元素为"-"regularExpretion = [NSRegularExpressionregularExpressionWithPattern:@"-{1,}"options:0error:nil] ;    content = [regularExpretion stringByReplacingMatchesInString:content options:NSMatchingReportProgressrange:NSMakeRange(0, content.length) withTemplate:@"-"];//  把多个"-"匹配为一个"-"//  根据"-"分割到数组NSArray*arr=[NSArrayarray];    content = [NSStringstringWithString:content];    arr =  [content componentsSeparatedByString:@"-"];NSMutableArray*marr=[NSMutableArrayarrayWithArray:arr];    [marr removeObject:@""];NSMutableString*string = [[NSMutableStringalloc] init];for(inti =0; i < arr.count; i++) {        [string appendString:[NSStringstringWithFormat:@"%@",arr[i]]];    }returnstring;}