ios 按照拼音对数组中的中文字符串排序的算法

//Step1:初始化
NSMutableArray *stringsToSort=[NSArray arrayWithObjects:
@"电脑",
@"显示器",
@"你好",
@"推特",
@"乔布斯",
@"再见",
@"暑假作业",
@"键盘",
@"鼠标",
@"谷歌",
@"苹果",
nil];
//Step1输出
NSLog(@"尚未排序的NSString数组:");
for(int i=0;i<[stringsToSort count];i++){
NSLog(@"%@",[stringsToSort objectAtIndex:i]);
}
//Step2:获取字符串中文字的拼音首字母并与字符串共同存放
NSMutableArray *chineseStringsArray=[NSMutableArray array];
for(int i=0;i<[stringsToSort count];i++){
ChineseString *chineseString=[[ChineseString alloc]init];
chineseString.string=[NSString stringWithString:[stringsToSort objectAtIndex:i]];
if(chineseString.string==nil){
chineseString.string=@"";
}
if(![chineseString.string isEqualToString:@""]){
NSString *pinYinResult=[NSString string];
for(int j=0;j<chineseString.string.length;j++){
NSString *singlePinyinLetter=[[NSString stringWithFormat:@"%c",pinyinFirstLetter([chineseString.string characterAtIndex:j])]uppercaseString];
pinYinResult=[pinYinResult stringByAppendingString:singlePinyinLetter];
}
chineseString.pinYin=pinYinResult;
}else{
chineseString.pinYin=@"";
}
[chineseStringsArray addObject:chineseString];
}
//Step2输出
NSLog(@"\n\n\n转换为拼音首字母后的NSString数组");
for(int i=0;i<[chineseStringsArray count];i++){
ChineseString *chineseString=[chineseStringsArray objectAtIndex:i];
NSLog(@"原String:%@----拼音首字母String:%@",chineseString.string,chineseString.pinYin);
}
//Step3:按照拼音首字母对这些Strings进行排序
NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"pinYin" ascending:YES]];
[chineseStringsArray sortUsingDescriptors:sortDescriptors];
//Step3输出
NSLog(@"\n\n\n按照拼音首字母后的NSString数组");
for(int i=0;i<[chineseStringsArray count];i++){
ChineseString *chineseString=[chineseStringsArray objectAtIndex:i];
NSLog(@"原String:%@----拼音首字母String:%@",chineseString.string,chineseString.pinYin);
}
// Step4:如果有需要，再把排序好的内容从ChineseString类中提取出来
NSMutableArray *result=[NSMutableArray array];
for(int i=0;i<[chineseStringsArray count];i++){
[result addObject:((ChineseString*)[chineseStringsArray objectAtIndex:i]).string];
}
//Step4输出
NSLog(@"\n\n\n最终结果:");
for(int i=0;i<[result count];i++){
NSLog(@"%@",[result objectAtIndex:i]);
}
//程序结束
NSLog(@"\n\n\nDemo By Hxy060799");