常见的NSString和NSMutableString方法：
NSString方法:
- +(id) stringWithContentsOfFile: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) stringWithContentsOfURL: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) string
-
创建一个新的空字符串
-
-
+(id) stringWithString:nsstring
- 创建一个新的字符串，并将其设置为nsstring
-
- -(id)initWithString:nsstring
-
将分配的字符串设置为nsstring
-
-
-(id) initWithContentsOfFile:path encoding:enc error:err
- 将字符串设置为path制定的文件的内容
-
- -(id) initWithContentsOfURL:url 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) (UNSIgned int)length
- 返回字符串中的字符数目
-
- -(unichar)characterAtIndex:i
-
返回索引i的Unicode字符
-
-
-(NSString *)substringFromIndex:i
- 返回从i开始知道结尾的子字符串
-
- -(NSString *)substringWithRange:range
-
根据指定范围返回子字符串
-
-
-(NSString *)substringToIndex:i
- 返回从该字符串开始到索i的子字符串
-
- -(NSComparator *)caseInsensitiveCompare:nsstring
-
比较两个字符串，忽略大小写
-
-
-(NSComparator *)compare:nsstring
- 比较两个字符串
-
- -(BOOL)hasPrefix:nsstring
-
测试字符串是否以nsstring开始
-
-
-(BOOL)hasSuffix:nsstring
- 测试字符串是否以nsstrng结尾
-
- -(BOOL)isEqualToString:nsstring
-
测试两个字符串是否相等
-
-
-(NSString *) capitalizedString
- 返回每个单词首字母大写的字符串（每个单词的其余字母转换为小写）
-
- -(NSString *)lowercaseString
-
返回转换为小写的字符串
-
-
-(NSString *)uppercaseString
- 返回转换为大写的字符串
-
- -(const char*)UTF8String
-
返回转换为UIF－8字符串的字符串
-
-
-(double)doubleValue
- 返回转换为double的字符串
-
- -(float)floatValue
-
返回转换为浮点值的字符串
-
-
-(NSInteger)integerValue
- 返回转换为NSInteger整数的字符串
-
- -(int)intValue
-
返回转换为整数的字符串
-
-
NSMutableString方法
- +(id) stringWithCapacity:size
-
创建一个字符串，初始包含size的字符
-
-
-(id) initWithCapacity:size
- 使用初始容量为size的字符串来初始化字符串
-
- -(void) setString:nsstring
-
将字符串设置为nsstring
-
-
-(void) appendString:nsstring
- 在接收者的末尾附加nsstring
-
- -(void) deleteCharactersInRange:range
-
删除指定range中的字符
-
-
-(void) insertString:nsstring atIndex:i
- 以索引i为起始位置插入nsstring
-
- -(void) replaceCharactersInRange:range withString:nsstring
-
使用nsstring替换range指定的字符
-
-
-(void) replaceOccurrencesOf
- String:nsstring withString:nsstring2 options:opts range:range
-
根
据选项opts。使用指定range中的nsstring2替换所有的nsstring。选项可以包括NSBackwardsSearch（从范围的结
尾 开始搜索）NSAnchoredSearch(nsstring必须匹配范围的开始)，NSLiteralSearch(执行逐字节比较以
及 NSCaceInsensitiveSearch的按位或组合)
NSArray的基本操作代码：
- /*---------------------------创建数组------------------------------*/
-
//NSArray *array = ［NSArray alloc] initWithObjects:
- @"One",@"Two",@"Three",@"Four",nil];
-
- self.dataArray = array;
-
[array release];
-
-
//- (unsigned) Count;数组所包含对象个数；
- NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
-
- //- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;
-
NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
-
-
- /*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/
-
- //arrayWithArray:
-
//NSArray *array1 = ［NSArray alloc] init];
- NSMutableArray *MutableArray = ［NSMutableArray alloc] init];
-
NSArray *array = [NSArray arrayWithObjects:
- @"a",@"b",@"c",nil];
-
NSLog(@"array:%@",array);
- MutableArray = [NSMutableArray arrayWithArray:array];
-
NSLog(@"MutableArray:%@",MutableArray);
-
-
array1 = [NSArray arrayWithArray:array];
- NSLog(@"array1:%@",array1);
-
-
-
//Copy
-
-
//id obj;
- NSMutableArray *newArray = ［NSMutableArray alloc] init];
-
NSArray *oldArray = [NSArray arrayWithObjects:
- @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
-
- NSLog(@"oldArray:%@",oldArray);
-
for(int i = 0; i < [oldArray count]; i++)
- {
-
obj = ［oldArray objectAtIndex:i] copy];
- [newArray addObject: obj];
-
}
- //
-
NSLog(@"newArray:%@", newArray);
- [newArray release];
-
-
-
//快速枚举
-
-
//NSMutableArray *newArray = ［NSMutableArray alloc] init];
- NSArray *oldArray = [NSArray arrayWithObjects:
-
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
- NSLog(@"oldArray:%@",oldArray);
-
- for(id obj in oldArray)
-
{
- [newArray addObject: obj];
-
}
- //
-
NSLog(@"newArray:%@", newArray);
- [newArray release];
-
-
-
//Deep copy
-
-
//NSMutableArray *newArray = ［NSMutableArray alloc] init];
- NSArray *oldArray = [NSArray arrayWithObjects:
-
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
- NSLog(@"oldArray:%@",oldArray);
-
newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
- NSLog(@"newArray:%@", newArray);
-
[newArray release];
-
-
- //Copy and sort
-
- //NSMutableArray *newArray = ［NSMutableArray alloc] init];
-
NSArray *oldArray = [NSArray arrayWithObjects:
- @"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
-
NSLog(@"oldArray:%@",oldArray);
- NSEnumerator *enumerator;
-
enumerator = [oldArray objectEnumerator];
- id obj;
-
while(obj = [enumerator nextObject])
- {
-
[newArray addObject: obj];
- }
-
[newArray sortUsingSelector:@selector(compare:)];
- NSLog(@"newArray:%@", newArray);
-
[newArray release];
-
-
-
-
/*---------------------------切分数组------------------------------*/
-
-
//从字符串分割到数组－ componentsSeparatedByString:
- NSString *string = ［NSString alloc] initWithString:@"One,Two,Three,Four"];
-
NSLog(@"string:%@",string);
- NSArray *array = [string componentsSeparatedByString:@","];
-
NSLog(@"array:%@",array);
- [string release];
-
-
-
//从数组合并元素到字符串- componentsJoinedByString:
- NSArray *array = ［NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
-
NSString *string = [array componentsJoinedByString:@","];
- NSLog(@"string:%@",string);
-
-
-
- /*******************************************************************************************
-
NSMutableArray
- *******************************************************************************************/
-
/*---------------给数组分配容量----------------*/
- //NSArray *array;
-
array = [NSMutableArray arrayWithCapacity:20];
-
-
-
-
/*--------------在数组末尾添加对象----------------*/
- //- (void) addObject: (id) anObject;
-
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
- @"One",@"Two",@"Three",nil];
-
[array addObject:@"Four"];
- NSLog(@"array:%@",array);
-
-
-
- /*--------------删除数组中指定索引处对象----------------*/
-
//-(void) removeObjectAtIndex: (unsigned) index;
- //NSMutableArray *array = [NSMutableArray arrayWithObjects:
-
@"One",@"Two",@"Three",nil];
- [array removeObjectAtIndex:1];
-
NSLog(@"array:%@",array);
-
-
-
-
/*-------------数组枚举---------------*/
- //- (NSEnumerator *)objectEnumerator;从前向后
-
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
- @"One",@"Two",@"Three",nil];
-
NSEnumerator *enumerator;
- enumerator = [array objectEnumerator];
-
- id thingie;
-
while (thingie = [enumerator nextObject]) {
- NSLog(@"thingie:%@",thingie);
-
}
-
-
- //- (NSEnumerator *)reverseObjectEnumerator;从后向前
-
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
- @"One",@"Two",@"Three",nil];
-
NSEnumerator *enumerator;
- enumerator = [array reverseObjectEnumerator];
-
- id object;
-
while (object = [enumerator nextObject]) {
- NSLog(@"object:%@",object);
-
}
-
-
- //快速枚举
-
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
- @"One",@"Two",@"Three",nil];
-
for(NSString *string in array)
- {
-
NSLog(@"string:%@",string);
- }
-
-
-
- /*******************************************************************************************
-
NSDictionary
- *******************************************************************************************/
-
- /*------------------------------------创建字典------------------------------------*/
-
//- (id) initWithObjectsAndKeys;
-
-
//NSDictionary *dictionary = ［NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
- NSString *string = [dictionary objectForKey:@"One"];
-
NSLog(@"string:%@",string);
- NSLog(@"dictionary:%@",dictionary);
-
[dictionary release];
-
-
- /*******************************************************************************************
-
NSMutableDictionary
- *******************************************************************************************/
-
- /*------------------------------------创建可变字典------------------------------------*/
-
//创建
- NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
-
- //添加字典
-
[dictionary setObject:@"One" forKey:@"1"];
- [dictionary setObject:@"Two" forKey:@"2"];
-
[dictionary setObject:@"Three" forKey:@"3"];
- [dictionary setObject:@"Four" forKey:@"4"];
-
NSLog(@"dictionary:%@",dictionary);
-
-
//删除指定的字典
- [dictionary removeObjectForKey:@"3"];
-
NSLog(@"dictionary:%@",dictionary);
-
-
- /*******************************************************************************************
-
NSValue（对任何对象进行包装）
- *******************************************************************************************/
-
- /*--------------------------------将NSRect放入NSArray中------------------------------------*/
-
//将NSRect放入NSArray中
- NSMutableArray *array = ［NSMutableArray alloc] init];
-
NSValue *value;
- CGRect rect = CGRectMake(0, 0, 320, 480);
-
value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
- [array addObject:value];
-
NSLog(@"array:%@",array);
-
-
//从Array中提取
- value = [array objectAtIndex:0];
-
[value getValue:&rect];
- NSLog(@"value:%@",value);
-
-
-
/*******************************************************************************************
- 从目录搜索扩展名为jpg的文件
-
*******************************************************************************************/
-
-
//NSFileManager *fileManager = [NSFileManager defaultManager];
- NSString *home;
-
home = @"../Users/";
-
-
NSDirectoryEnumerator *direnum;
- direnum = [fileManager enumeratorAtPath: home];
-
- NSMutableArray *files = ［NSMutableArray alloc] init];
-
- //枚举
-
NSString *filename;
- while (filename = [direnum nextObject]) {
-
if(［filename pathExtension] hasSuffix:@"jpg"]){
- [files addObject:filename];
-
}
- }
-
- //快速枚举
-
//for(NSString *filename in direnum)
- //{
-
// if(［filename pathExtension] isEqualToString:@"jpg"]){
- // [files addObject:filename];
-
// }
- //}
-
NSLog(@"files:%@",files);
-
-
//枚举
- NSEnumerator *filenum;
-
filenum = [files objectEnumerator];
- while (filename = [filenum nextObject]) {
-
NSLog(@"filename:%@",filename);
- }
-
- //快速枚举
-
//for(id object in files)
- //{
-
// NSLog(@"object:%@",object);
- //}
NSString和NSMutableString常用方法+NSArray常用代码 (转),布布扣,bubuko.com
NSString和NSMutableString常用方法+NSArray常用代码 (转)
原文：http://www.cnblogs.com/luluping/p/3751841.html
