iOS 字符串 数组 字典 操作!
常用的操作
enumerateKeysAndObjectsUsingBlock 字典遍历
enumerateObjectsUsingBlock 数组遍历
characterAtIndex substringWithRange 字符串遍历
componentsSeparatedByString 字典转数组
//字典转json格式字符串：
- (NSString*)dictionaryToJson:(NSDictionary *)dic
{
NSError *parseError = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];
return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}//json格式字符串转字典：
- (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString {
if (jsonString == nil) {
return nil;
}
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *err;
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingMutableContainers
error:&err];
if(err) {
NSLog(@"json解析失败：%@",err);
return nil;
}
return dic;
} componentsSeparatedByString 按特定分割字符串转数组
containsString 判断是否包含某个字符串
allKeys 取出字典所有key (数组)
allValues 取出字典所有Values (数组)
[str substringToIndex:[self.pwd length]-1] substringToIndex 截掉最后一个 substringFromIndex 截取最后一个
[str stringByAppendingString:tags] //字符串的追加,但是需要初始化字符串
str =[strM stringByReplacingOccurrencesOfString:@"@2x.png" withString:@""]; //统一去掉后缀
[str hasPrefix:@"https://"] //判断字符串前缀 hasSuffix //后缀
字符串的操作
1. 创建一个新的空字符串
NSString *string1 = [NSString string];
// C语言字符串
char *name = "hello word";
// 初始化一个字符串，在赋值
NSString *string2 = [[NSString alloc] init];
string2 = @"wangchong";
NSString *string3 = @"hello";
// 一下两个方法是把字符串做一次拷贝,返回拷贝后的字符串
NSString *string4 = [NSString stringWithString:@"hello"];
NSString *string5 = [[NSString alloc] initWithString:string3];
NSLog(@"%p,%p,%p",&string3,&string4,&string5);
NSString *string6 = [string5 stringByAppendingString:@"\nHi"];
// 把C的字符串转化为OC的字符串
NSString *str = [[NSString alloc] initWithUTF8String:"hello world"];
NSString *str2 = [NSString stringWithUTF8String:"hello world"];
// 用格式化字符串初始化 可完成字符串的拼接以及完成C的字符串与OC的字符串的转化
int a = 123;
NSString *str3 = [[NSString alloc]initWithFormat:@"a = %d %s%@", a, "aaaa", @"bbbb"];
NSString *str4 = [NSString stringWithFormat:@"%s","hello world"];2.字符串的类型转换
NSString * str = @"hello";
const char *p = [str UTF8String]; // 将OC字符串转化为C的字符串
str = @"123";
int a = [str intValue]; // 将数字串转化成整型数据
[str floatValue]; // 将数字串转化成float型
[str doubleValue]; // 将数字串转化成double型
// 结构体 输出
// 结构体 [点] 转换字符串
NSString *str1 = NSStringFromCGPoint(point);
// 结构体 [尺寸] 转换字符串
NSString *str2 = NSStringFromCGSize(size);
// 结构体 [矩形] 转换字符串
NSString *str3 = NSStringFromCGRect(rect);3.字符串大小写转换
// 全部转为大写 结果 ABC
[@"abc" uppercaseString];
// 全部转为小写 结果 bcd
[@"BCD" lowercaseString];
// 首字母大写 结果 Acb
[@"acb" capitalizedString];4.字符串比较
// 比较两个字符串内容是否相同
// 相等返回 yes 不相等返回 no
BOOL b =[str isEqualToString:str2];
//判断str2中是否包含str1
[str2 containsString:str1];
// 忽略大小写进行比较
NSComparisonResult result1 = [string caseInsensitiveCompare:str];
NSComparisonResult result2 = [string localizedCaseInsensitiveCompare:str];
// 两个字符串内容比较
// NSComparisonResult result = {NSOrderedAscending, NSOrderedSame，NSOrderedDescending}
// NSOrderedAscending 右边 > 左边 == -1
// NSOrderedSame 内容相同 == 0
// NSOrderedDescending 左边 > 右边 == 1
NSComparisonResult result3 = [str compare:str2];
NSComparisonResult result4 = [string compare:@"taojian" options:NSCaseInsensitiveSearch];
NSComparisonResult result5 = [string compare:@"taojian" options:NSCaseInsensitiveSearch range:NSMakeRange(0, string.length)];
NSComparisonResult result6 = [string compare:@"taojian" options:NSCaseInsensitiveSearch range:NSMakeRange(0, string.length) locale:nil];
NSComparisonResult result7 = [string localizedCompare:str];
options: // 枚举参数
enum{
NSCaseInsensitiveSearch = 1, // 不区分大小写比较
NSLiteralSearch = 2, // 区分大小写比较
NSBackwardsSearch = 4, // 从字符串末尾开始搜索
NSAnchoredSearch = 8, // 搜索限制范围的字符串
NSNumbericSearch = 64 // 按照字符串里的数字为依据，算出顺序。例如 Foo2.txt < Foo7.txt < Foo25.txt
// 以下定义高于 mac os 10.5 或者高于 iphone 2.0 可用 ,
NSDiacriticInsensitiveSearch = 128, // 忽略 "-" 符号的比较
NSWidthInsensitiveSearch = 256, // 忽略字符串的长度，比较出结果
NSForcedOrderingSearch = 512 // 忽略不区分大小写比较的选项，并强制返回 NSOrderedAscending 或者 NSOrderedDescending
// 以下定义高于 iphone 3.2 可用 ,
/// 只能应用于 rangeOfString:..., stringByReplacingOccurrencesOfString:...和 replaceOccurrencesOfString:... 方法。
/// 使用通用兼容的比较方法，如果设置此项，可以去掉 NSCaseInsensitiveSearch 和 NSAnchoredSearc
NSRegularExpressionSearch = 10245.字符串搜索
// 判断字符串是否以abc开头
[@"abcdfa" hasPrefix:@"abc"];
// 判断字符串是否bcd结尾
[@"adbcd" hasSuffix:@"bcd"];
// 判断字符串是否包含指定字符串，返回位置和长度
NSRange range = [@"123456" rangeOfString:@"456"];
// 搜索字符串所在的范围
NSRange range = [@"123456456qweasasd456" rangeOfString:@"456" options:NSBackwardsSearch]; // 输出{17, 3}
// 指定范围进行搜索
NSRange range = NSMakeRange(0, 9);
range = [@"123456456qweasasd456" rangeOfString:@"456" options:NSBackwardsSearch range:range];
// 找与之开头相同的字符 返回相同开头的字符串
NSString *string = @"fg s abcdefg hijklmn s d \n fdsgf";
NSString *str = [string commonPrefixWithString:@"fgsdfgrg" options:NSLiteralSearch]; // 输出fg6.字符串截取
NSString * str5 = @"helloworld";
NSString * ptr1 = [str5 substringToIndex:2];// 字符串抽取 从头开始抽取2个字母,返回he
NSString * ptr2 = [str5 substringFromIndex:4];// 从第4个字母开始抽取到字符串结束,返回oworld
NSRange range1 = {6,2};// 结构体初始化
NSString * ptr3 = [str5 substringWithRange:range1];// 在range指定范围内抽取,返回or
NSString * ptr4 = [str5 substringWithRange:NSMakeRange(6,2)];// NSMakeRange可以生成一个结构体
// 取出字符串"123-456-789-000"中的数字部分,组成一个新的字符串输出
NSMutableString *strm = [NSMutableString stringWithString:@"123-456-789-000"]; //只有可变字符串有这个方法
[strm replaceOccurrencesOfString:@"-"
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, strm.length)];
NSLog(@"%@",strm); //输出:123456789000
// substringToIndex 截掉最后一个 // substringFromIndex 截取最后一个
[str substringToIndex:[self.pwd length]-1]
//字符串的追加,但是需要初始化字符串
[str stringByAppendingString:tags]
//统一去掉后缀
str =[strM stringByReplacingOccurrencesOfString:@"@2x.png" withString:@""];
//判断字符串前缀 hasSuffix //后缀
[str hasPrefix:@"https://"]
7.字符串的遍历
// 根据\n遍历
NSString *string = @" s abcdefg hijklmn s d \n fdsf";
// 根据\n一行一行的打印
[string enumerateLinesUsingBlock:^(NSString *line, BOOL *stop){
NSLog(@"\n%@",line);
}
];
// 根据 条件options 遍历
NSString *string = @" s abcdefg hijklmn s d ";
NSMutableString * mutableString = [NSMutableString string];
// NSStringEnumerationByWords：将string按空格分开，并且会自动清理首尾的空格
// 这个方法会把中间多余的空格也清理掉，比如上面的字符串，s和d之间有两个空格，会变成一个空格
[string enumerateSubstringsInRange:NSMakeRange(0, string.length) options:NSStringEnumerationByWords usingBlock:
^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop)
{
[mutableString appendFormat:@"%@ ",substring];
}];
// 删除我们添加的末尾的一个空格
[mutableString deleteCharactersInRange:NSMakeRange(outputString.length-1, 1)];8.路径操作与数组操作
// 用指定字符串分割字符串，返回一个数组
NSArray *array = [@"1,2,3,4,5,6" componentsSeparatedByString:@","];
// 根据空格拆分
NSArray *array = [string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
// 将数组中的字符串组合成一个文件路径
NSMutableArray *components = [NSMutableArray array];
[components addObject:@"Users"];
[components addObject:@"CentralPerk"];
[components addObject:@"Desktop"];
NSString *path = [NSString pathWithComponents:components];
NSLog(@"%@",path); //Users/CentralPerk/Desktop
// 将一个路径分割成一个数组
NSArray *array1 = [path pathComponents];
NSLog(@"%@",array1);
// 判断是否为绝对路径(依据：是否以'/'开始)
path = @"/Users/CentralPerk/Desktop";
NSLog(@"%i",[path isAbsolutePath]);
// 获取最后一个目录
NSLog(@"%@",[path lastPathComponent]);
// 删除最后一个目录
NSLog(@"%@",[path stringByDeletingLastPathComponent]);
// 拼接一个目录
NSLog(@"%@",[path stringByAppendingPathComponent:@"aaa"]); //Users/CentralPerk/Desktop/aaa
NSLog(@"%@",[path stringByAppendingString:@"aaa"]); //Users/CentralPerk/Desktopaaa
NSLog(@"%@",[path stringByAppendingFormat:@"%@%@",@"b",@"c"]); //Users/CentralPerk/Desktopbc9.文件扩展名
// 拓展名出来
// 获取拓展名,不带.
NSString *str2 = @"Users/CentralPerk/Desktop/test.txt";
NSLog(@"%@",[str2 pathExtension]);
// 添加拓展名,不需要带.
NSLog(@"%@",[str2 stringByAppendingPathExtension:@"mp3"]);
// 删除拓展名,带.一块删除
NSLog(@"%@",[str2 stringByDeletingPathExtension]);10.文件操作
// 将字符串设置为path制定的文件的内容
-(id) initWithContentsOfFile:path encoding:enc error:err
// 创建一个新字符串并将其设置为path指定的文件的内容，使用字符编码enc，如果非零，则返回err中错误
+(id) stringWithContentsOfFile:path encoding:enc error:err
// 将字符串设置为url(NSURL *)url的内容，使用字符编码enc，如果非零，则返回err中的错误
-(id) initWithContentsOfURL:url encoding:enc error:err
// 创建一个新的字符串，并将其设置为url的内容，使用字符编码enc，如果非零，则返回err中的错误
+(id) stringWithContentsOfURL:url encoding:enc error:err11.补充
// 求字符串长度
[str1 length]
// 获取字符串中的字符
[str1 characterAtIndex:1]
// 清楚左右两段的空格
NSString *str = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
// 在字符串后面补0
NSString *str = [string stringByPaddingToLength:12 withString:@"0" startingAtIndex:0];二、NSMutableString
// 将不可变的字符串转换为可变的字符串
NSMutableString * str = [[NSMutableString alloc]initWithString:@"hello world"];
// 在指定下标为2的(不要越界)位置插入013字符串
[str insertString:@"013" atIndex:2];
// 在字符串末尾追加字符串taotao
[str appendString:@"taotao"];
// 从0位置删除2个字符
[str deleteCharactersInRange:NSMakeRange(0, 2)];
// 给字符串重新赋值
[str setString:@"yintian"];
// 将3位置后1个字符替换成ios字符串
[str replaceCharactersInRange:NSMakeRange(3, 1) withString:@"ios"];
// 根据选项 opts ，使用指定 range 中的nsstring2 替换所有的 nsstring
-(void)replaceOccurrencesOfString:nsstring withString:nsstring2 options:opts range:range
数组操作!
int count = [array count];//个数
// 判断是否包含了某个元素
if ([array containsObject:@"a"]) {
NSLog(@"包含了字符串a");
}
NSString *last = [array lastObject];最后一个元素
NSString *str = [array objectAtIndex:1];根据索引获取数组中的元素
int index = [array indexOfObject:@"c"];获取指定元素的索引
// 让数组里面的所有对象都调用test方法，123为参数
NSArray *array = [NSArray arrayWithObjects:stu1, stu2, stu3, nil nil];
[array makeObjectsPerformSelector:@selector(test2:) withObject:@"123"];
NSArray *array = [NSArray arrayWithObjects:@"1", @"2", @"3", @"4", nil nil];
// 1-2-3-4
// 利用分隔符-拼接所有的数组元素
NSString *str = [array componentsJoinedByString:@"-"];
// 将一个数组写入文件（生成的是一个xml文件）
NSString *path = @"/Users/apple/Desktop/array.xml";
[array writeToFile:path atomically:YES];
path = @"/Users/apple/Desktop/array.txt";
// 从文件中读取数组内容（文件有严格的格式要求）
NSArray *array2 = [NSArray arrayWithContentsOfFile:path];
#pragma mark 遍历数组1
void arrayFor1() {
NSArray *array = [NSArray arrayWithObjects:stu1, @"1", @"2", @"3", nil nil];
int count = array.count;
for (int i = 0; i<count; i++) {
id obj = [array objectAtIndex:i];
}
}
#pragma mark 遍历数组2 快速遍历
void arrayFor2() {
Student *stu1 = [Student student];
NSArray *array = [NSArray arrayWithObjects:stu1, @"1", @"2", @"3", nil nil];
int i =0;
for (id obj in array) {
NSLog(@"%i-%@", i, obj);
i++;
}
}
#pragma mark 遍历数组3
void arrayFor3() {
Student *stu1 = [Student student];
NSArray *array = [NSArray arrayWithObjects:stu1, @"1", @"2", @"3", nil nil];
[array enumerateObjectsUsingBlock:
^(id obj, NSUInteger idx, BOOLBOOL *stop) {
NSLog(@"%i-%@", idx, obj);
// 如果索引为1，就停止遍历
if (idx == 1) {
// 利用指针修改外面BOOL变量的值
*stop = YES;
}
}];
}
#pragma mark 遍历数组4
void arrayFor4() {
Student *stu1 = [Student student];
NSArray *array = [NSArray arrayWithObjects:stu1, @"1", @"2", @"3", nil nil];
// 获取数组的迭代器
// NSEnumerator *enumerator = [array objectEnumerator];
// 反序迭代器（从尾部开始遍历元素）
NSEnumerator *enumerator = [array reverseObjectEnumerator];
// allObjects是取出没有被遍历过的对象
NSArray *array2 = [enumerator allObjects];
NSLog(@"array2:%@", array2);
// 获取下一个需要遍历的元素
id obj = nil;
while (obj = [enumerator nextObject]) {
NSLog(@"obj=%@", obj);
}
}
#pragma mark 数组排序1
void arraySort1() {
NSArray *array = [NSArray arrayWithObjects:@"2", @"3", @"1", @"4", nil nil];
// 返回一个排好序的数组，原来数组的元素顺序不会改变
// 指定元素的比较方法：compare:
NSArray *array2 = [array sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"array2:%@", array2);
}
#pragma mark 数组排序2
void arraySort2() {
Student *stu1 = [Student studentWithFirstname:@"MingJie" lastname:@"Li"];
Student *stu2 = [Student studentWithFirstname:@"LongHu" lastname:@"Huang"];
Student *stu3 = [Student studentWithFirstname:@"LianJie" lastname:@"Li"];
Student *stu4 = [Student studentWithFirstname:@"Jian" lastname:@"Xiao"];
NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3, stu4, nil nil];
// 指定排序的比较方法
NSArray *array2 = [array sortedArrayUsingSelector:@selector(compareStudent:)];
NSLog(@"array2:%@", array2);
}
- (NSComparisonResult)compareStudent:(Student *)stu {
// 先按照姓排序
NSComparisonResult result = [self.lastname compare:stu.lastname];
// 如果有相同的姓，就比较名字
if (result == NSOrderedSame) {
result = [self.firstname compare:stu.firstname];
}
return result;
}
#pragma mark 数组排序3
void arraySort3() {
Student *stu1 = [Student studentWithFirstname:@"MingJie" lastname:@"Li"];
Student *stu2 = [Student studentWithFirstname:@"LongHu" lastname:@"Huang"];
Student *stu3 = [Student studentWithFirstname:@"LianJie" lastname:@"Li"];
Student *stu4 = [Student studentWithFirstname:@"Jian" lastname:@"Xiao"];
NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3, stu4, nil nil];
// 利用block进行排序
NSArray *array2 = [array sortedArrayUsingComparator:
^NSComparisonResult(Student *obj1, Student *obj2) {
// 先按照姓排序
NSComparisonResult result = [obj1.lastname compare:obj2.lastname];
// 如果有相同的姓，就比较名字
if (result == NSOrderedSame) {
result = [obj1.firstname compare:obj2.firstname];
}
return result;
}];
NSLog(@"array2:%@", array2);
}
#pragma mark 数组排序4-高级排序
void arraySort4() {
Student *stu1 = [Student studentWithFirstname:@"MingJie" lastname:@"Li" bookName:@"book1"];
Student *stu2 = [Student studentWithFirstname:@"LongHu" lastname:@"Huang" bookName:@"book2"];
Student *stu3 = [Student studentWithFirstname:@"LianJie" lastname:@"Li" bookName:@"book2"];
Student *stu4 = [Student studentWithFirstname:@"Jian" lastname:@"Xiao" bookName:@"book1"];
NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3, stu4, nil nil];
// 1.先按照书名进行排序
// 这里的key写的是@property的名称
NSSortDescriptor *bookNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"book.name" ascending:YES];
// 2.再按照姓进行排序
NSSortDescriptor *lastnameDesc = [NSSortDescriptor sortDescriptorWithKey:@"lastname" ascending:YES];
// 3.再按照名进行排序
NSSortDescriptor *firstnameDesc = [NSSortDescriptor sortDescriptorWithKey:@"firstname" ascending:YES];
// 按顺序添加排序描述器
NSArray *descs = [NSArray arrayWithObjects:bookNameDesc, lastnameDesc, firstnameDesc, nil nil];
NSArray *array2 = [array sortedArrayUsingDescriptors:descs];
NSLog(@"array2:%@", array2);
}
字典操作
//创建词典
NSDictionary *dictionary=[NSDictionary dictionaryWithObjectsAndKeys:@"wujy",@"name",@29,@"age",nil];
NSInteger Count=[dictionary count];
NSLog(@"词典的个数为%ld",Count);
//得到词典中的所有key
NSEnumerator *enumeratorkey=[dictionary keyEnumerator];
for (NSObject *obj in enumeratorkey) {
NSLog(@"key为：%@",obj);
NSLog(@"通过key找到value值为：%@",[dictionary objectForKey:obj]);
}
//得到词典中的所有value值
NSEnumerator *enumeratorvalue=[dictionary objectEnumerator];
for (NSObject *obj in enumeratorvalue) {
NSLog(@"value为：%@",obj);
}
//简便的方式创建 key排前面value排后面
NSDictionary *newDictionary=@{@"name":@"wujy",@"age":@29};
NSArray *keyArray=[newDictionary allKeys];
for (NSObject *obj in keyArray) {
NSLog(@"key的值为：%@",obj);
}
NSArray *valueArray=[newDictionary allValues];
for (NSObject *obj in valueArray) {
NSLog(@"value的值为：%@",obj);
}
//blocks插件
NSDictionary *blockDictionary=[NSDictionary dictionaryWithObjects:[[NSArray alloc] initWithObjects:@3,@15,@29,nil] forKeys:[[NSArray alloc] initWithObjects:@"IOS",@"work",@"age",nil]];
//遍历
[blockDictionary bk_each:^(id key, id obj) {
NSLog(@"使用blocks的key为:%@",key);
NSLog(@"对应的value为:%@",obj);
}];
//过滤 只在第一个符合条件时就停止
NSDictionary *matchDictionary=[blockDictionary bk_match:^BOOL(id key, id obj) {
BOOL select=[obj intValue]<10?YES:NO;
return select;
}];
NSLog(@"match符合的项为：%@",matchDictionary);
//过滤
NSDictionary *selectDictionary=[blockDictionary bk_select:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>10?YES:NO;
return select;
}];
NSLog(@"select符合的项为%@",selectDictionary);
//反向过滤
NSDictionary *rejectDictionary=[blockDictionary bk_reject:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>10?YES:NO;
return select;
}];
NSLog(@"reject符合的项为%@",rejectDictionary);
//对各个项进行修改
NSDictionary *mapDictinary=[blockDictionary bk_map:^id(id key, id obj) {
return [NSNumber numberWithInt:[obj intValue]+1];
}];
NSLog(@"map修改后的项为%@",mapDictinary);
//是否符合条件 返回bool
BOOL isSelected=[blockDictionary bk_any:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>20?YES:NO;
return select;
}];
NSLog(@"%d符合条件",isSelected);
//判断是否所有的项都符合这个条件
BOOL allSelected=[blockDictionary bk_all:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>20?YES:NO;
return select;
}];
NSLog(@"%d符合条件",allSelected);
//判断是否所有的项都不符合这个条件
BOOL noneSelected=[blockDictionary bk_none:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>50?YES:NO;
return select;
}];
NSLog(@"%d符合条件",noneSelected);
//创建一个nsmutabledictionary
NSMutableDictionary *mutableDictionary=[NSMutableDictionary dictionaryWithCapacity:3];
[mutableDictionary setObject:@"wujy" forKey:@"name"];
[mutableDictionary setObject:@"cnblogs.com/wujy" forKey:@"webName"];
[mutableDictionary setObject:@29 forKey:@"age"];
//得到词典中的所有key
NSEnumerator *enumeratorkey=[mutableDictionary keyEnumerator];
for (NSObject *obj in enumeratorkey) {
NSLog(@"key为：%@",obj);
NSLog(@"通过key找到value值为：%@",[mutableDictionary objectForKey:obj]);
}
//删除其中一个key
[mutableDictionary removeObjectForKey:@"name"];
NSLog(@"删除name的key以后值：%@",mutableDictionary);
[mutableDictionary removeAllObjects];
NSLog(@"删除所有以后，可变词典个数为%ld",[mutableDictionary count]);
//blocks
//过滤
NSMutableDictionary *newmutableDictionary=[NSMutableDictionary dictionaryWithDictionary:@{@"IOS":@3,@"work":@13,@"age":@29}];
[newmutableDictionary bk_performSelect:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>10?YES:NO;
return select;
}];
NSLog(@"过滤后的可变词典为(29,13)%@",newmutableDictionary);
//取反过滤
[newmutableDictionary bk_performReject:^BOOL(id key, id obj) {
BOOL select=[obj intValue]>20?YES:NO;
return select;
}];
NSLog(@"取反过滤的可变词典为(13)%@",newmutableDictionary);
//修改各个项的结果
[newmutableDictionary bk_performMap:^id(id key, id obj) {
return @([obj intValue]+1);
}];
NSLog(@"修改后的可变词典为(14)%@",newmutableDictionary);
挥毫泼墨,书写人生篇章
