NSString和NSMutableString常用方法+NSArray常用代码 (转)

Posted on 2014-05-25 23:23 linFen 阅读(1708) 评论(0) 编辑收藏举报

常见的NSString和NSMutableString方法：

NSString方法:

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+(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：

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/*---------------------------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);
//}

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NSString和NSMutableString常用方法+NSArray常用代码 (转)