一些API的用法
//1、init初始化
NSString * str1 = [[NSString alloc] init];
NSLog(@"str1 = %@",str1);
//2、initWithBytes:length:encoding:从给定字符串按照给定获取方向,得到指定个数的字符
NSString * str2 = [[NSString alloc] initWithBytes:"afasffaf" length:6 encoding:NSUTF8StringEncoding];
NSLog(@"str2 = %@",str2);
//3、initWithCharacters:length:从一个C语言字符串获得lenth个元素
UniChar s[8] = {'e','4','g','d','d','g'};
NSString * str3 = [[NSString alloc] initWithCharacters:s length:4];
NSLog(@"str3 = %@",str3);
//4、initWithCString:encoding:按照方向从一个C语言字符串获得元素
NSString * str4 = [[NSString alloc] initWithCString:"fasfa" encoding:NSUTF8StringEncoding];
NSLog(@"str4 = %@",str4);
//5、initWithUTF8String:初始化,用UTF8格式String
NSString * str5 = [[NSString alloc] initWithUTF8String:"ARQWRT"];
NSLog(@"str5 = %@",str5);
[str5 release];
//6、initWithFormat:用给定字符串初始化
NSString * str6 = [[NSString alloc] initWithFormat:@"QRQWTQT"];
[str6 release];
// 7、stringWithFormat:便利构造器
NSString * str7 = [NSString stringWithFormat:@"qqqqqq"];
[str7 release];
//8、stringWithCharacters:length:从C语言字符串获取length个字符
NSString * str8 = [NSString stringWithCharacters:s length:2];
//9、stringWithString:字符串初始化字符串
NSString * str9 = [NSString stringWithString:str8];
[str9 release];
//10、stringWithCString:encoding:便利构造器创建字符串
NSString * str10 = [NSString stringWithCString:"sasfaf" encoding:NSUTF8StringEncoding];
NSLog(@"str10 = %@",str10);
//11、stringWithUTF8String:便利构造器创建字符串
NSString * str11 = [NSString stringWithUTF8String:"qw er"];
// 12、length字符串长度
unsigned long result = [str11 length];
NSLog(@"result = %ld",result);
//13、lengthOfBytesUsingEncoding:
unsigned long a = [str11 lengthOfBytesUsingEncoding:NSUTF16StringEncoding];
NSLog(@"a = %ld",a);
//14、characterAtIndex:指定下标的字符
UniChar a1 = [str11 characterAtIndex:2];
NSLog(@"a1 = %hd",a1);
//15、getCharacters:range:获取一定范围内的字符
NSRange ran = NSMakeRange(1, 2);
[str11 getCharacters:s range:ran];
for (int i = 0; i < ran.length; i++) {
NSLog(@"s[i] = %c",s[i]);
}
//16、cStringUsingEncoding:以一定格式转成C字符串
const char * p1 = [str11 cStringUsingEncoding:NSUTF8StringEncoding];
NSLog(@"p1 = %s",p1);
//17、UTF8String
const char * p2 = [str11 UTF8String];
NSLog(@"p2 = %s",p2);
//18、stringByAppendingFormat:添加字符
NSString * str12 = [str11 stringByAppendingFormat:@"aaaaaa"];
//19、stringByAppendingString:用字符串添加
NSString * str13 = [str12 stringByAppendingString:str11];
//20、stringByPaddingToLength:withString:startingAtIndex:创建一个新字符串,长度为length,旧字符串从索引字符开始拷贝到旧字符串后面
NSString * str14 = [str13 stringByPaddingToLength:20 withString:str13 startingAtIndex:1];
NSLog(@"str14 = %@",str14);
//21、componentsSeparatedByString://返回一个数组,字符串字串被给定的字符串分存到数组里
NSString * str15 = @"affaf, rq, 41wre";
NSArray * array = [str15 componentsSeparatedByString:@" "];
NSLog(@"%@",array);
//22、componentsSeparatedByCharactersInSet:用指定字符分割
NSArray * array1 = [str15 componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@" "]];
NSLog(@"%@",array1);
//23、substringFromIndex:获得指定下标的子字符串
NSString * str16 = [str14 substringFromIndex:10];
NSLog(@"str16 = %@",str16);
//24、substringWithRange:一定范围的字符串,字串
NSRange ran1 = NSMakeRange(2, 4);
NSString * str17 = [str14 substringWithRange:ran1];
NSLog(@"str17 = %@",str17);
//25、substringToIndex:到指定下标的字串
NSString * str18 = [str14 substringToIndex:10];
NSLog(@"str18 = %@",str18);
//26、rangeOfString:字符串范围
NSRange ran2 = [str14 rangeOfString:@"aaaqwe"];
NSLog(@"location = %ld,lenth = %ld",ran2.location,ran2.length);
//27、rangeOfString:options:从指定方向查找字符串,返回范围
NSRange ran3 = [str14 rangeOfString:@"qweraaaa" options: NSBackwardsSearch];
NSLog(@"location = %ld,lenth = %ld",ran3.location,ran3.length);
// 28、rangeOfString:options:range:从指定方向指定范围查找字符串,返回范围
NSRange ran4 = [str14 rangeOfString:@"raaaaa" options:NSBackwardsSearch range:NSMakeRange(1, 15)];
NSLog(@"location = %ld,lenth = %ld",ran4.location,ran4.length);
//29、stringByReplacingOccurrencesOfString:withString:指定范围内的字串用给定的字符串替换
NSString * string = @"qqqqqqq";
NSString * str20 = [str14 stringByReplacingCharactersInRange:ran2 withString:string];
NSLog(@"str20 = %@",str20);
//30、stringByReplacingOccurrencesOfString:withString:options:range:按照指定方向,在指定范围内的指定字符串替换成给定字符串
NSString * str21 = [str14 stringByReplacingOccurrencesOfString:@"aaa" withString:@"AAAA" options:NSBackwardsSearch range:NSMakeRange(1, 10)];
NSLog(@"str21 = %@",str21);
//31、stringByReplacingCharactersInRange:withString:指定范围内的字符串用给定那个字符串替换
NSString * str22 = [str14 stringByReplacingCharactersInRange:ran1 withString:@"AAAAA"];
NSLog(@"str22 = %@",str22);
//32、caseInsensitiveCompare:字符串比较
NSComparisonResult temp = [str14 caseInsensitiveCompare:@"qweraav"];
NSLog(@"temp = %ld",temp);
//33、compare:字符串比较
NSComparisonResult temp1 = [str14 compare:@"aaaa"];
NSLog(@"temp1 = %ld",temp1);
//34、compare:options:指定方向比较
NSComparisonResult temp2 = [str14 compare:@"zzzzz" options:NSBackwardsSearch];
NSLog(@"temp2 = %ld",temp2);
//35、compare:options:range:指定方向,指定范围字符串与给定字符串比较
NSComparisonResult temp3 = [str14 compare:@"zzzz" options:NSBackwardsSearch range:NSMakeRange(3, 4)];
NSLog(@"temp3 = %ld",temp3);
//36、hasPrefix:判断字符串是否以指定字符串开头
if ([str14 hasPrefix:@"qwe"]) {
NSLog(@"yes");
}
//37、hasSuffix:判断字符串是否以指定字符串结束
if ([str14 hasSuffix:@"abc"]) {
NSLog(@"yes");
}else{
NSLog(@"no");
}
//38、isEqualToString:比较字符串是否相等
if ([str14 isEqualToString:@"qwertty"]) {
NSLog(@"yes");
}else{
NSLog(@"no");
}
//39、capitalizedString//首字母大写
NSString * str23 = [str14 capitalizedString];
NSLog(@"str23 = %@",str23);
//40、lowercaseString全转小写
NSString * str24 = [str14 lowercaseString];
NSLog(@"str24 = %@",str24);
//41、uppercaseString//全转大写
NSString * str25 = [str14 uppercaseString];
//42、doubleValue
NSString * str26 = @"a2797.79";
double d1 = [str26 doubleValue];
NSLog(@"d1 = %lf",d1);
//43、floatValue
float d2 = [str26 floatValue];
NSLog(@"d2 = %lf",d2);
//44、intValue
int d3 = [str26 intValue];
//45、integerValue
unsigned long d4 = [str26 integerValue];
NSLog(@"d4 = %ld",d4);
//46、longLongValue
long long d5 = [str26 longLongValue];
NSLog(@"d5 = %lld",d5);
//47、boolValue //遇到"Y", "y", "T", "t"或者数字返回YES
NSString * str27 = @"afa";
BOOL bo = [str27 boolValue];
if (bo) {
NSLog(@"yes");
}
NSLog(@"%@",str14);
NSLog(@"%@",str25);
NSLog(@"d2 = %.2d",d3);
NSLog(@"d5 = %ld",d4);
//48、stringWithCapacity:便利构造器创建可变字符串
id mustr = [NSMutableString stringWithCapacity:10];
//49、initWithCapacity:初始化一个可变字符串
NSMutableString * mustr1 = [[NSMutableString alloc] initWithCapacity:20];
//50、appendFormat:追加字符串
[mustr1 appendFormat:@"affgf"];
NSLog(@"%@",mustr1);
//51、appendString:用字符串追加到旧字符串上
[mustr appendString:mustr1];
NSLog(@"%@",mustr);
//52、deleteCharactersInRange:删除指定范围内的字符串
[mustr deleteCharactersInRange:NSMakeRange(1, 2)];
NSLog(@"%@",mustr);
//53、insertString:atIndex:在指定下标除插入字符串
[mustr1 insertString:mustr atIndex:0];
NSLog(@"mustr1 = %@",mustr1);
//54、replaceCharactersInRange:withString:用给定字符串替换原串指定范围内的字符串
[mustr1 replaceCharactersInRange:NSMakeRange(1, 7) withString:@"agqrqrqe"];
NSLog(@"mustr1 = %@",mustr1);
//55、replaceOccurrencesOfString:withString:options:range:从指定方向开始,遇到要被替换的字符串,用替换字符串替换它,并返回被替换字符串在原来字符串的开始位置下标
NSUInteger i = [mustr1 replaceOccurrencesOfString:@"aagq" withString:@"zaz" options:NSBackwardsSearch range:NSMakeRange(0, 4)];
NSLog(@"mustr1 = %@",mustr1);
NSLog(@"i = %ld",i);
//56、setString:字符串重置
[mustr1 setString:@"fffffff"];
// NSArray
//1、array便利构造器
id myarray = [NSArray array];
NSLog(@"myarray = %@",myarray);
// 2、arrayWithArray:便利构造器方法,用一个数组初始化数组
NSArray * ar1 = [NSArray arrayWithObject:@"aaaaa"];
NSArray * ar2 = [NSArray arrayWithArray:ar1];
NSLog(@"ar2 = %@",ar2);
//3、arrayWithObject:一个元素初始化数组
NSArray * ar3 = [NSArray arrayWithObject:@"sssss"];
NSLog(@"ar3 = %@",ar3);
//4、arrayWithObjects:多个元素初始化数组
NSArray * ar4 = [NSArray arrayWithObjects:@"qwer",@"asdf",@"zxcv", nil];
NSLog(@"ar4 = %@",ar4);
//5、arrayWithObjects:count:用指定元素个数,初始化数组,注意参数
NSString * strings[3] = {@"qwe",@"asd",@"zxc"};
NSArray * ar5 = [NSArray arrayWithObjects:strings count:3];
//6、init
//7、initWithArray:用数组初始化数组
NSArray * ar6 = [[NSArray alloc] initWithArray:ar5];
[ar6 release];
//8、initWithObjects:给定多个对象初始化数组
NSArray * ar7 = [[NSArray alloc] initWithObjects:@"qwer",@"asdf",@"zxcv",nil];
[ar7 release];
//9、initWithObjects:count:初始化一个数组,给定元素个数(参数const id [])
NSArray * ar8 = [[NSArray alloc] initWithObjects:strings count:3];
//10、containsObject:判断是否含有指定元素
if([ar8 containsObject:@"qwe"]){
NSLog(@"yes");
}
//11、count数组元素个数
unsigned long b = [ar8 count];
NSLog(@"%ld",b);
//12、getObjects:range:返回一个数组,给定一个范围,在原数组里逐一获取元素到接收数组
id *obj;
NSRange range1 = NSMakeRange(1, 2);
obj = malloc(sizeof(id)*range1.length);
[ar8 getObjects:obj range:range1];
for (int i = 0; i < range1.length; i++) {
NSLog(@"obj = %@",obj[i]);
}
free(obj);
//13、firstObject返回一个数组--原数组的第一个元素
NSLog(@"ar8 = %@",ar8);
NSArray * ar10 = [ar8 firstObjectCommonWithArray:ar8];
NSLog(@"ar10 = %@",ar10);
//14、lastObject返回数组最后一个元素
NSArray * ar11 = [ar8 lastObject];
[ar11 release];
//15、objectAtIndex:返回指定索引值的元素
NSArray * ar13 = [ar8 objectAtIndex:1];
NSLog(@"ar13 = %@",ar13);
//16、objectsAtIndexes:返回一个数组,指定索引值的元素
NSIndexSet * ss = [NSIndexSet indexSetWithIndex:2];
NSArray * ar14 = [ar8 objectsAtIndexes:ss];
NSLog(@"ar14 = %@",ar14);
//17、objectEnumerator 返回索引,可以根据返回索引值输出数组元素
NSEnumerator * enum1 = [ar8 objectEnumerator];
id myobj;
while (myobj = [enum1 nextObject]) {
NSLog(@"obj = %@",myobj);
}
//18、reverseObjectEnumerator反向获取下标,返回下标值,可以反向输出数组元素
NSEnumerator * enum2 = [ar8 reverseObjectEnumerator];
id myobj1;
while (myobj1 = [enum2 nextObject]) {
NSLog(@"obj1 = %@",myobj1);
}
//19、indexOfObject:返回元素下标
unsigned long temp19 = [ar8 indexOfObject:@"asd"];
NSLog(@"temp 19 = %ld",temp19);
//20、indexOfObject:inRange:在指定范围内找出给定对象,返回下标值
unsigned long temp20 = [ar8 indexOfObject:@"asd" inRange:NSMakeRange(1, 1)];
NSLog(@"temp20 = %ld",temp20);
//21、makeObjectsPerformSelector:
//22、makeObjectsPerformSelector:withObject:
//23、firstObjectCommonWithArray:第一个相同的元素
NSArray * ar22 = [NSArray arrayWithObjects:@"qeqe",@"asd",nil];
id ar23 = [ar8 firstObjectCommonWithArray:ar22];
NSLog(@"ar23 = %@",ar23);
// 24、isEqualToArray:比较是否相等
if ([ar8 isEqualToArray:ar22]) {
NSLog(@"yes");
}else{
NSLog(@"no");
}
//25、arrayByAddingObject:将指定对象添加到数组
NSArray * ar25 = [ar8 arrayByAddingObject:@"tyu"];
NSLog(@"ar25 = %@",ar25);
//26、arrayByAddingObjectsFromArray:从一个数组添加元素
NSArray * ar26 = [ar8 arrayByAddingObjectsFromArray:ar25];
NSLog(@"ar26 = %@",ar26);
//27、sortedArrayUsingFunction:context:
//28、sortedArrayUsingDescriptors:
//29、sortedArrayUsingSelector:
//30、componentsJoinedByString:用指定对象,符号分割数组元素
NSString * string30 = [ar8 componentsJoinedByString:@"--"];
NSLog(@"string30 = %@",string30);
//31、arrayWithCapacity:便利构造器创建一个可变数组
NSMutableArray * mar1 = [NSMutableArray arrayWithCapacity:20];
//32、initWithCapacity:初始化可变数组
NSMutableArray * mar2 = [[NSMutableArray alloc] initWithCapacity:20];
//33、addObject:向可变数组添加给定对象
[mar1 addObject:@"afgh"];
NSLog(@"mar1 = %@",mar1);
//34、addObjectsFromArray:从数组中向可变数组添加对象
[mar2 addObjectsFromArray:ar8];
NSLog(@"mar2 = %@",mar2);
//35、insertObject:atIndex:在指定下标除增加一个对象
[mar2 insertObject:@"qqq" atIndex:2];
NSLog(@"mar2 = %@",mar2);
//36、removeAllObjects移除可变数组内的所有对象
[mar1 removeAllObjects];
NSLog(@"mar1 = %@",mar1);
//37、removeLastObject//移除可变数组最后一个对象
[mar2 removeLastObject];
NSLog(@"mar2 = %@",mar2);
//38、removeObject:从可变数组内移除给定对象
[mar2 removeObject:@"qqq"];
NSLog(@"mar2 = %@",mar2);
//39、removeObject:inRange:移除指定范围内的一个对象
[mar2 removeObject:@"qwe" inRange:NSMakeRange(0, 1)];
NSLog(@"mar2 = %@",mar2);
//40、removeObjectAtIndex:移除指定下标的元素
[mar2 addObjectsFromArray:ar8];
NSLog(@"mar2 = %@",mar2);
[mar2 removeObjectAtIndex:3];
NSLog(@"mar2 = %@",mar2);
//41、removeObjectsInArray:将给定数组的元素从可变数组中全部移除
[mar2 removeObjectsInArray:ar8];
NSLog(@"mar2 = %@",mar2);
[mar2 addObjectsFromArray:ar8];
NSLog(@"mar2 = %@",mar2);
//42、removeObjectsInRange:移除给定范围内的所有元素
[mar2 removeObjectsInRange:NSMakeRange(0, 1)];
NSLog(@"mar2 = %@",mar2);
//43、replaceObjectAtIndex:withObject:用给出的对象替换指定下标的元素
[mar2 replaceObjectAtIndex:1 withObject:@"kkkkk"];
NSLog(@"mar2 = %@",mar2);
//44、setArray:重置可变数组
[mar2 setArray:ar8];
NSLog(@"mar2 = %@",mar2);
//exchangeObjectAtIndex:withObjectAtIndex:指定下标的两个元素交换
[mar2 exchangeObjectAtIndex:2 withObjectAtIndex:1];
NSLog(@"mar2 = %@",mar2);
