1、创建字符串对象数组
NSArray *array = [strcomponentsSeparatedByString:@"@"];//就是以@为标示 输出看看啦
int count=[array count];
int i;
for(i=0;i2、可变的字符串类
NSMutableString *song=[[NSMutableString alloc]init];
[song appendString:@"Deaf Leppard"];
printf("%s\n",[song UTF8String]);
NSRange range=[songrangeOfString:@"Deaf"];//获取字符串"Deaf"字串的范围
[song replaceCharactersInRange:rangewithString:@"Def"];//替换
printf("%s\n",[song UTF8String]);
[song insertString:@"Animal by "atIndex:0];
printf("%s\n",[song UTF8String]);
[song release];
3、字典加数组操作
NSArray *keys=[@"one two three"componentsSeparatedByString:@" "];
NSArray *value=[@"two bravo a"componentsSeparatedByString:@" "];
NSDictionary *dic=[[NSDictionary alloc]initWithObjects:value forKeys:keys];
printf("%s\n",[[dic description]UTF8String]);
一、NSString
1、创建常量字符串。
NSString*astring = @"This is a String!";
2、创建空字符串，给予赋值。
NSString*astring = [[NSString alloc] init];
astring =@"This is a String!";
[astringrelease];
NSLog(@"astring:%@",astring);
3、在以上方法中，提升速度:initWithString方法
NSString*astring = [[NSString alloc] initWithString:@"This is aString!"];
NSLog(@"astring:%@",astring);
[astringrelease];
4、用标准c创建字符串:initWithCString方法
charCstring = "This is a String!";
NSStringastring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astringrelease];
5、创建格式化字符串:占位符（由一个%加一个字符组成）
int i =1;
int j =2;
NSString*astring = [[NSString alloc] initWithString:[NSStringstringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astringrelease];
6、创建临时字符串
NSString*astring;
astring =[NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
7、读写文件
NSStringpath = @"astring.text";
NSStringastring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
NSStringastring = [[NSString alloc] initWithString:@"This is aString!"];
NSLog(@"astring:%@",astring);
NSStringpath =@"astring.text";
[astringwriteToFile: path atomically: YES];
[astring release];
8、用C比较:strcmp函数
charstring1[] = "string!";
charstring2[] = "string!";
if(strcmp(string1, string2) = = 0)
{
NSLog(@"1");
}
9、比较字符串
//isEqualToString方法
NSStringastring01 = @"This is a String!";
NSStringastring02 = @"This is a String!";
BOOL result= [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//compare方法(comparer返回的三种值)
NSStringastring01 = @"This is a String!";
NSStringastring02 = @"This is aString!";
BOOL result= [astring01 compare:astring02] = =NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame判断两者内容是否相同
NSStringastring01 = @"This is a String!";
NSStringastring02 = @"this is a String!";
BOOL result= [astring01 compare:astring02] = =NSOrderedAscending;
NSLog(@"result:%d",result);
//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
NSStringastring01 = @"this is a String!";
NSStringastring02 = @"This is a String!";
BOOL result= [astring01 compare:astring02] = =NSOrderedDescending;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串1
NSStringastring01 = @"this is a String!";
NSStringastring02 = @"This is a String!";
BOOL result= [astring01 caseInsensitiveCompare:astring02] = =NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串2
NSStringastring01 = @"this is a String!";
NSStringastring02 = @"This is a String!";
BOOL result= [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = =NSOrderedSame;
NSLog(@"result:%d",result);
//NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写NSNumericSearch:比较字符串的字符个数，而不是字符值。
NSStringstring1 = @"A String";
NSStringstring2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
10、查找子字符串
NSStringstring1 = @"This is a string";
NSStringstring2 = @"string";
NSRangerange = [string1 rangeOfString:string2];
int location= range.location;
int leight =range.length;
NSString*astring = [[NSString alloc] initWithString:[NSStringstringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];
//-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
NSStringstring1 = @"This is a string";
NSStringstring2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
NSStringstring1 = @"This is a string";
NSStringstring2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
NSStringstring1 = @"This is a string";
NSStringstring2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
11、扩展路径
NSStringPath = @"~/NSData.txt";
NSStringabsolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePathstringByAbbreviatingWithTildeInPath]);
//文件扩展名
NSString*Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
12、stringWithCapacity:
NSMutableString *String;
String =[NSMutableString stringWithCapacity:40];
13、拼接字符串appendString: and appendFormat:
NSMutableString *String1 = [[NSMutableString alloc]initWithString:@"This is a NSMutableString"];
//[String1appendString:@", I will be adding some character"];
[String1appendFormat:[NSString stringWithFormat:@", I will be adding somecharacter"]];
NSLog(@"String1:%@",String1);
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc]initWithString:@"This is a NSMutableString"];
[String1insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
//-setString:
NSMutableString *String1 = [[NSMutableString alloc]initWithString:@"This is a NSMutableString"];
[String1setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
//-setString:
NSMutableString *String1 = [[NSMutableString alloc]initWithString:@"This is a NSMutableString"];
[String1replaceCharactersInRange:NSMakeRange(0, 4)withString:@"That"];
NSLog(@"String1:%@",String1);
14、检查字符串是否以另一个字符串开头
-(BOOL) hasPrefix: (NSString )aString;
NSStringString1 = @"NSStringInformation.txt";
[String1hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") :NSLog(@"NO");
[String1hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") :NSLog(@"NO");
15、查找字符串某处是否包含其它字符串
-(NSRange) rangeOfString: (NSString *)aString，这一点前面在串中搜索子串用到过;
二、NSArray
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.dataArrayobjectAtIndex:2]);
//arrayWithArray:
NSArray*array1 = [[NSArray alloc] init];
NSMutableArray MutableArray = [[NSMutableArray alloc] init];
NSArrayarray = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
MutableArray= [NSMutableArray arrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);
array1 =[NSArray arrayWithArray:array];
NSLog(@"array1:%@",array1);
Copy
//idobj;
NSMutableArray newArray = [[NSMutableArray alloc] init];
NSArrayoldArray = [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);
[newArrayrelease];
快速枚举
//NSMutableArray newArray = [[NSMutableArray alloc] init];
NSArrayoldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(id objin oldArray)
{
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArrayrelease];
Deepcopy
NSMutableArray newArray = [[NSMutableArray alloc] init];
NSArrayoldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
newArray =(NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault,(CFPropertyListRef)oldArray,kCFPropertyListMutableContainers);
NSLog(@"newArray:%@", newArray);
[newArrayrelease];
Copy andsort
NSMutableArray newArray = [[NSMutableArray alloc] init];
NSArrayoldArray = [NSArray arrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
NSLog(@"oldArray:%@",oldArray);
NSEnumerator*enumerator;
enumerator =[oldArray objectEnumerator];
idobj;
while(obj =[enumerator nextObject])
{
[newArray addObject: obj];
}
[newArraysortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@", newArray);
[newArray release];
//从字符串分割到数组－componentsSeparatedByString:
NSStringstring = [[NSString alloc]initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string);
NSArrayarray = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[string release];
//从数组合并元素到字符串- componentsJoinedByString:
NSArrayarray = [[NSArray alloc]initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSStringstring = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
NSArray*array;
array =[NSMutableArray arrayWithCapacity:20];
//- (void)addObject: (id) anObject;
NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[arrayaddObject:@"Four"];
NSLog(@"array:%@",array);
//-(void)removeObjectAtIndex: (unsigned)index;
NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[arrayremoveObjectAtIndex:1];
NSLog(@"array:%@",array);
//-(NSEnumerator *)objectEnumerator;从前向后
NSMutableArray array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumeratorenumerator;
enumerator =[array objectEnumerator];
idthingie;
while(thingie = [enumerator nextObject]) {
NSLog(@"thingie:%@",thingie);
}
//-(NSEnumerator *)reverseObjectEnumerator;从后向前
NSMutableArray array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumeratorenumerator;
enumerator =[array reverseObjectEnumerator];
idobject;
while(object = [enumerator nextObject]) {
NSLog(@"object:%@",object);
}
快速枚举
NSMutableArray array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
for(NSStringstring in array)
{
NSLog(@"string:%@",string);
}
//- (id)initWithObjectsAndKeys;
NSDictionarydictionary = [[NSDictionary alloc]initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
NSStringstring = [dictionary objectForKey:@"One"];
NSLog(@"string:%@",string);
NSLog(@"dictionary:%@",dictionary);
[dictionary release];
//创建
NSMutableDictionary *dictionary = [NSMutableDictionarydictionary];
//添加字典
[dictionarysetObject:@"One" forKey:@"1"];
[dictionarysetObject:@"Two" forKey:@"2"];
[dictionarysetObject:@"Three" forKey:@"3"];
[dictionarysetObject:@"Four" forKey:@"4"];
NSLog(@"dictionary:%@",dictionary);
//删除指定的字典
[dictionaryremoveObjectForKey:@"3"];
NSLog(@"dictionary:%@",dictionary);
//将NSRect放入NSArray中
NSMutableArray array = [[NSMutableArray alloc] init];
NSValuevalue;
CGRect rect= CGRectMake(0, 0, 320,480);
value =[NSValue valueWithBytes:&rectobjCType:@encode(CGRect)];
[arrayaddObject:value];
NSLog(@"array:%@",array);
//从Array中提取
value =[array objectAtIndex:0];
[valuegetValue:&rect];
NSLog(@"value:%@",value);
NSFileManager fileManager = [NSFileManager defaultManager];
NSStringhome;
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(idobject in files)
//{
// NSLog(@"object:%@",object);
//}