iOS工具 -对字典的键值对儿进行排序

键值对儿排序

1 - 代码封装：我们对 NSMutableDictionary 进行扩展

// - NSMutableDictionary+stringSortedFromDictionary.h

#import <Foundation/Foundation.h>
@interface NSMutableDictionary (stringSortedFromDictionary)

// 无序排列：键值对儿以 & 连接
+ (NSString*)stringFromMutDicUnordered:(NSMutableDictionary*)dic;

// 以 allKeys 的首字母升序排列：键值对儿以 & 连接
+ (NSString*)stringFromMutDicOrderedByInitial:(NSMutableDictionary*)dic;

@end

// - NSMutableDictionary+stringSortedFromDictionary.m

#import "NSMutableDictionary+stringSortedFromDictionary.h"
@implementation NSMutableDictionary (stringSortedFromDictionary)

/* 如需对返回结果进行 UTF-8 编码，在相应方法中的最后返回值处修改以下代码即可

    编码：方式一
    NSString *str = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)string,NULL,(CFStringRef)@"!*'();:@&=+$,/?%#[]",kCFStringEncodingUTF8 ));
    return str;

 
    编码：方式二
    NSString *str = [NSString stringWithCString:[string UTF8String] encoding:NSUnicodeStringEncoding];
    return str;

*/

// 无序排列：键值对儿以 & 连接
+ (NSString*)stringFromMutDicUnordered:(NSMutableDictionary*)dic{

    NSString *finalStr = @"";
    for (NSString *key in dic) {

        NSString *str1 = [NSString stringWithFormat:@"%@=%@",key,dic[key]];

        if([finalStr isEqualToString:@""]){

            finalStr = str1;
        }else{

            finalStr = [NSString stringWithFormat:@"%@&%@",str1,finalStr];
        }
    }

    return finalStr;
}

// 以 allKeys 的首字母升序排列：键值对儿以 & 连接
+ (NSString*)stringFromMutDicOrderedByInitial:(NSMutableDictionary*)dic{

    NSMutableString *contentString  =[NSMutableString string];
    NSArray *keys = [dic allKeys];

    // 字符串按字母顺序排序
    NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        return [obj1 compare:obj2 options:NSNumericSearch];
    }];

    // 字符串拼接
    for (NSString *categoryId in sortedArray) {

        [contentString appendFormat:@"%@=%@&", categoryId, [dic valueForKey:categoryId]];
    }

    // 过滤最后字符 &
    NSString *finalStr =[contentString substringToIndex:contentString.length - 1];
    return finalStr;

}
@end