取子串 substring
NSString *str4 = @"iPhone6Plus";
fromIndex(从中间往后)
NSString *str5 = [str4 substringFromIndex:5];
toIndex(从头到中间)
NSString *str6 = [str4 substringToIndex:6];
withRange(从哪开始 到第几个 需要定义结构体)
NSRange r = NSMakeRange(6, 1);
NSString *str7 = [str4 substringWithRange:NSMakeRange(6, 1)];
判断前缀/后缀
if ([str4 hasPrefix:@"iPh"]) {
NSLog(@"有该前缀");
}
if ([str4 hasSuffix:@"Plus"]) {
NSLog(@"有该后缀");
}
字符串 万能转换公式
stringWithFormat
NSString *str4 = [NSString stringWithFormat:@"I have %@%d%@", str1, 6, str3];
//拼接方法
NSString *str5 = [str1 stringByAppendingString:str2];
//替换方法
NSString *str6 = [str5 stringByReplacingOccurrencesOfString:@"Plus" withString:@"s"];
//相等
if ([str6 isEqualToString:str7]) {
NSLog(@"两个字符串内容相同")
}
//字符串比较
NSString *str1 = @"iPhone6Plus";
NSString *str2 = @"iPhone7";
NSComparisonResult r = [str1 compare:str2];
if (r == NSOrderedAscending) {
NSLog(@"升序");
}
else if (r == NSOrderedDescending)
{
NSLog(@"降序");
}
else if (r == NSOrderedSame)
{
NSLog(@"相等");
}
/NSMutableString 可变字符串
//创建之后 内容可以改变
//可变数据类 一般初始化为空
NSMutableString *mStr = [NSMutableString string];
//拼接字符串
[mStr appendString:@"DLS"];
[mStr appendString:@"150303"];
NSLog(@"%@", mStr);
//插入
[mStr insertString:@"lanou" atIndex:0];
//删除(第几个开始到后面的第几个)
[mStr deleteCharactersInRange:NSMakeRange(2, 2)];
//NSArray 不可变数组
//数组的创建
NSArray *arr1 = [NSArray arrayWithObjects:@"iPhone", @"Android", @"WinPhone", @"中文", nil];
//数组元素个数
NSLog(@"count %ld", arr1.count);
//通过下标获取相应位置的元素
NSString *str = [arr1 objectAtIndex:3];
for (NSInteger i = 0; i < arr1.count; i++) {
NSLog(@"%@",[arr1 objectAtIndex:i]);
}
//NSMutableArray 可变数组
NSMutableArray *mArr = [NSMutableArray array];
//添加
[mArr addObject:@"xiaoXiao"];
[mArr addObject:@"jiLaoBan"];
[mArr addObject:@"kangKang"];
//插入
[mArr insertObject:@"bigTree" atIndex:2];
//替换
[mArr replaceObjectAtIndex:0 withObject:@"suibian"];
//交换
[mArr exchangeObjectAtIndex:0 withObjectAtIndex:1];
//删除
[mArr removeObjectAtIndex:2];
NSLog(@"%@", mArr);

//NSDictionary 不可变字典
//字典用来存放key-value(键值对)
//key必须唯一 value必须是对象
//字典是无需集合 所有的操作都通过key实现
//但是创建的时候 value在前 Key在后
//在字典中 value用 object表示
/* NSDictionary *dic1 = [NSDictionary dictionaryWithObjectsAndKeys:@"lilei", @"name", @"male", @"sex", nil];
NSLog(@"%@", dic1);
//所有key
NSLog(@"%@", dic1.allKeys);
//所有value
NSLog(@"%@", dic1.allValues);
//通过key值访问对应value objectForKey是字典访问
NSLog(@"%@", [dic1 objectForKey:@"name"]);
NSLog(@"-------------");
//字典的遍历
//1.得到key数组
//2.遍历key数组 得到每一个key
//3,通过key得到每一个value
for (NSInteger i = 0; i < dic1.allKeys.count; i++) {
NSString *p = [dic1.allKeys objectAtIndex:i];
NSLog(@"%@ = %@", p, [dic1 objectForKey:p]);
}
*/
/* NSMutableDictionary *mDic = [NSMutableDictionary dictionary];
//添加键值对
//setObject:forKey: 字典方法
//setValue:forKey: KVC方法
//当key值不存在的时候 添加新的key-value对
//当key存在时 找到对应key-value 修改对应的value值
[mDic setObject:@"hanmeimei" forKey:@"name"];
[mDic setObject:@"male" forKey:@"sex"];
[mDic removeObjectForKey:@"sex"];
NSLog(@"%@", mDic);
*/
//练习
//遍历可变字典
//1.创建可变字典
//2.添加key- value对 name sex age hobby
//3.遍历
/* NSMutableDictionary *mStr = [NSMutableDictionary dictionary];
[mStr setObject:@"xiaoming" forKey:@"name"];
[mStr setObject:@"male" forKey:@"sex"];
[mStr setObject:@"20" forKey:@"age"];
[mStr setObject:@"play" forKey:@"hobby"];
for (NSInteger i = 0; i < mStr.allKeys.count; i++) {
NSString *p = [mStr.allKeys objectAtIndex:i];
NSLog(@"%@ %@", p, [mStr objectForKey:p]);
}
*/
//NSSet 不可变集合
//无序 唯一 对象
/* NSSet *set1 = [NSSet setWithObjects:@"a", @"p", @"p", @"l", @"l", @"e", nil];
NSLog(@"%@", set1);
//集合个数
NSLog(@"%ld", set1.count);
//获取某个元素
NSLog(@"%@", [set1 anyObject]);
//是否包含
if ([set1 containsObject:@"p"]) {
NSLog(@"包含");
}
//可变集合
NSMutableSet *set2 = [NSMutableSet set];
//添加
[set2 addObject:@"c"];
[set2 addObject:@"b"];
[set2 addObject:@"a"];
//删除
[set2 removeObject:@"a"];
NSLog(@"%@", set2);
// NSCountedSet 计数集合
NSCountedSet *cSet = [NSCountedSet setWithSet:set2];
[cSet addObject:@"b"];
NSLog(@"%@", cSet);
//计数
NSLog(@"count %ld", [cSet countForObject:@"b"]);
*/
//快读枚举器 for-in
//遍历数组 数组中每个元素
/* NSArray *arr = [NSArray arrayWithObjects:@"1", @"3", @"3", nil];
//获得从集合中得到的每一个元素
for (NSArray *temp in arr) {
NSLog(@"%@", temp);
}
//遍历字典 字典的key 通过key可以访问对应的value
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"lilei", @"name", @"male", @"sex", nil];
for (NSString *key in dic) {
NSLog(@"%@ %@", key, [dic objectForKey:key]);
}
*/
//数组排序
NSArray *arr = [NSArray arrayWithObjects:@"kangKang", @"daShu", @"jiLaoBan", @"haoGe", @"xiaoQiang", @"xiaoMing", nil];
NSLog(@"%@", arr);
//方法选择器
SEL s = @selector(compare:);
NSArray *newArray = [arr sortedArrayUsingSelector:s];
NSLog(@"%@", newArray);
//可变数组的排序
NSMutableArray *marr = [NSMutableArray arrayWithArray:arr];
NSLog(@"%@", marr);
[marr sortUsingSelector:@selector(compare:)];
NSLog(@"%@", marr);

http://blog.csdn.net/yuzhiboyi?viewmode=contents

NSString *path = @"/Users/dlios/Desktop/area.txt";
NSString *str = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSArray *mStr = [str componentsSeparatedByString:@"\n"];
NSMutableArray *province = [NSMutableArray array];
for (NSString *s in mStr) {
if (![s hasPrefix:@" "]) {
NSMutableDictionary *pDic = [NSMutableDictionary dictionary];
[pDic setObject:s forKey:@"name"];
NSMutableArray *cArr = [NSMutableArray array];
[pDic setObject:cArr forKey:@"city"];
[province addObject:pDic];
}
else if ([s hasPrefix:@" "] && ![s hasPrefix:@" "])
{
NSMutableDictionary *cDic = [NSMutableDictionary dictionary];
[cDic setObject:s forKey:@"name"];
NSMutableArray *cArr = [NSMutableArray array];
[cDic setObject:cArr forKey:@"zone"];
NSMutableDictionary * pDic = [province lastObject];
NSMutableArray *zArr = [pDic objectForKey:@"city"];
[zArr addObject:cDic];
}
else if([s hasPrefix:@" "])
{
NSMutableDictionary *pDic = [province lastObject];
NSMutableArray *cArr = [pDic objectForKey:@"city"];
NSMutableDictionary *cDic = [cArr lastObject];
NSMutableArray *zArr = [cDic objectForKey:@"zone"];
[zArr addObject:s];
}
}
NSLog(@"%@", province);

http://www.cnbeta.com/articles/377401.htm

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