iOS开发－字符串和数组NSString NSArray的操作

iOS开发中 字符串和数组NSString NSArray操作

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;i<count;i=i+4)

{

printf("%i: %s\n",i,[[arrayobjectAtIndex:i] UTF8String]);

}

2 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

char*Cstring = "This is a String!";

NSString*astring = [[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);

NSString*path = @"astring.text";

NSString*astring = [[NSString alloc] initWithContentsOfFile:path];

NSLog(@"astring:%@",astring);

[astringrelease];

NSString*astring = [[NSString alloc] initWithString:@"This is aString!"];

NSLog(@"astring:%@",astring);

NSString*path =@"astring.text";

[astringwriteToFile: path atomically: YES];

[astringrelease];

//用C比较:strcmp函数

charstring1[] = "string!";

charstring2[] = "string!";

if(strcmp(string1, string2) = = 0)

{

NSLog(@"1");

}

//isEqualToString方法

NSString*astring01 = @"This is a String!";

NSString*astring02 = @"This is a String!";

BOOL result= [astring01 isEqualToString:astring02];

NSLog(@"result:%d",result);

//compare方法(comparer返回的三种值)

NSString*astring01 = @"This is a String!";

NSString*astring02 = @"This is aString!";

BOOL result= [astring01 compare:astring02] = =NSOrderedSame;

NSLog(@"result:%d",result);

//NSOrderedSame判断两者内容是否相同

NSString*astring01 = @"This is a String!";

NSString*astring02 = @"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)

NSString*astring01 = @"this is a String!";

NSString*astring02 = @"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

NSString*astring01 = @"this is a String!";

NSString*astring02 = @"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

NSString*astring01 = @"this is a String!";

NSString*astring02 = @"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。

NSString*string1 = @"A String";

NSString*string2 = @"String";

NSLog(@"string1:%@",[string1 uppercaseString]);//大写

NSLog(@"string2:%@",[string2 lowercaseString]);//小写

NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小

NSString*string1 = @"This is a string";

NSString*string2 = @"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);

[astringrelease];

//-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

NSString*string1 = @"This is a string";

NSString*string2 = [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

NSString*string1 = @"This is a string";

NSString*string2 = [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

NSString*string1 = @"This is a string";

NSString*string2 = [string1 substringWithRange:NSMakeRange(0, 4)];

NSLog(@"string2:%@",string2);

//扩展路径

NSString*Path = @"~/NSData.txt";

NSString*absolutePath = [Path stringByExpandingTildeInPath];

NSLog(@"absolutePath:%@",absolutePath);

NSLog(@"Path:%@",[absolutePathstringByAbbreviatingWithTildeInPath]);

//文件扩展名

NSString*Path = @"~/NSData.txt";

NSLog(@"Extension:%@",[Path pathExtension]);

//stringWithCapacity:

NSMutableString *String;

String =[NSMutableString stringWithCapacity:40];

//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);

//01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *)aString;

NSString*String1 = @"NSStringInformation.txt";

[String1hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") :NSLog(@"NO");

[String1hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") :NSLog(@"NO");

//02：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;

NSArray*array = [[NSArray alloc] initWithObjects:

@"One",@"Two",@"Three",@"Four",nil];

self.dataArray = array;

[arrayrelease];

//-(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];

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

//idobj;

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);

[newArrayrelease];

//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 objin oldArray)

{

[newArray addObject: obj];

}

//

NSLog(@"newArray:%@", newArray);

[newArrayrelease];

//Deepcopy

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);

[newArrayrelease];

//Copy andsort

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];

idobj;

while(obj =[enumerator nextObject])

{

[newArray addObject: obj];

}

[newArraysortUsingSelector:@selector(compare:)];

NSLog(@"newArray:%@", newArray);

[newArrayrelease];

//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);

[stringrelease];

//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);

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];

NSEnumerator*enumerator;

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];

NSEnumerator*enumerator;

enumerator =[array reverseObjectEnumerator];

idobject;

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);

}

//- (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);

[dictionaryrelease];

//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];

NSValue*value;

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];

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(idobject in files)

//{

// NSLog(@"object:%@",object);

//}