NSMutableArray*priceArray=[NSMutableArray array];
for (NSString*greadStr in greadPriceArr)
{
//greadStr=1_10_100
NSArray*dataArray=[greadStr componentsSeparatedByString:@"_"];
//把分割之后的元素转化成NSNumber 添加到另外一个数组内
NSNumber * number = [NSNumber numberWithFloat:[[dataArray objectAtIndex:2] floatValue]];
[priceArray addObject:number];
}
//在对priceArray 数组进行升序操作
NSArray *result = [priceArray sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return [obj1 compare:obj2]; //升序
return [obj2 compare:obj1]; //降序
}];