NSStirng、NSArray、以及枚举(Method小集合)

以下内容由angellixf整理,这里制作记录:

/*******************************************************************************************     
 NSString     
 *******************************************************************************************/     
//一、NSString         
/*----------------创建字符串的方法----------------*/     
    
//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!";     
[astring release];     
NSLog(@"astring:%@",astring);     
    
    
    
//3、在以上方法中，提升速度:initWithString方法     
    
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];     
NSLog(@"astring:%@",astring);     
[astring release];     
    
    
    
//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);     
[astring release];     
    
    
    
//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:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];     
NSLog(@"astring:%@",astring);     
[astring release];     
    
    
    
//6、创建临时字符串     
    
NSString *astring;     
astring = [NSString stringWithCString:"This is a temporary string"];     
NSLog(@"astring:%@",astring);     
    
    
    
    
/*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/         
    
NSString *path = @"astring.text";     
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];     
NSLog(@"astring:%@",astring);     
[astring release];     
    
    
/*----------------写字符串到文件:writeToFile方法----------------*/         
    
    
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];     
NSLog(@"astring:%@",astring);     
NSString *path = @"astring.text";         
[astring writeToFile: path atomically: YES];     
[astring release];         
    
    
    
    
/*----------------比较两个字符串----------------*/             
    
//用C比较:strcmp函数     
    
char string1[] = "string!";     
char string2[] = "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 a String!";         
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。     
    
    
/*----------------改变字符串的大小写----------------*/         
    
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     
    
    
/*----------------在串中搜索子串----------------*/             
    
NSString *string1 = @"This is a string";     
NSString *string2 = @"string";     
NSRange range = [string1 rangeOfString:string2];     
int location = range.location;     
int leight = range.length;     
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];     
NSLog(@"astring:%@",astring);     
[astring release];     
    
    
/*----------------抽取子串 ----------------*/             
    
//-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:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);     
    
    
    
//文件扩展名     
NSString *Path = @"~/NSData.txt";     
NSLog(@"Extension:%@",[Path pathExtension]);     
    
    
    
    
/*******************************************************************************************     
 NSMutableString     
 *******************************************************************************************/         
    
/*---------------给字符串分配容量----------------*/     
//stringWithCapacity:     
NSMutableString *String;     
String = [NSMutableString stringWithCapacity:40];     
    
    
/*---------------在已有字符串后面添加字符----------------*/         
    
//appendString: and appendFormat:     
    
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];     
//[String1 appendString:@", I will be adding some character"];     
[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];     
NSLog(@"String1:%@",String1);     
*/     
    
    
/*--------在已有字符串中按照所给出范围和长度删除字符------*/         
/*     
 //deleteCharactersInRange:     
 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];     
 [String1 deleteCharactersInRange:NSMakeRange(0, 5)];     
 NSLog(@"String1:%@",String1);     
    
    
    
 /*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/     
    
//-insertString: atIndex:     
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];     
[String1 insertString:@"Hi! " atIndex:0];     
NSLog(@"String1:%@",String1);     
    
    
    
/*--------将已有的空符串换成其它的字符串------*/     
    
//-setString:     
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];     
[String1 setString:@"Hello Word!"];     
NSLog(@"String1:%@",String1);     
    
    
    
/*--------按照所给出的范围，和字符串替换的原有的字符------*/     
    
//-setString:     
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];     
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];     
NSLog(@"String1:%@",String1);     
    
    
    
/*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/     
//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";     
[String1 hasPrefix:@"NSString"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");     
[String1 hasSuffix:@".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     
 *******************************************************************************************/     
    
/*---------------------------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);     
//}