开发中经常涉及到用把参数拼接成字符串用MD5加密的方式做一个标识符，以下是字典用key以升序的方式排列并转成字符串，并用递归的方式把value中的字典也转成字符串：
-(NSString*)stringWithDict:(NSDictionary*)dict{
NSArray*keys = [dictallKeys];
NSArray*sortedArray = [keyssortedArrayUsingComparator:^NSComparisonResult(idobj1,idobj2) {
return[obj1compare:obj2options:NSNumericSearch];
}];
NSString*str =@"";
for(NSString*categoryIdinsortedArray) {
idvalue = [dictobjectForKey:categoryId];
if([valueisKindOfClass:[NSDictionaryclass]]) {
value = [selfstringWithDict:value];
}
//NSLog(@"[dict objectForKey:categoryId] === %@",[dict objectForKey:categoryId]);
if([strlength] !=0) {
str = [strstringByAppendingString:@";"];
}
str = [strstringByAppendingFormat:@"%@:%@",categoryId,value];
}
returnstr;
}
