实例方法创建字符串.pdfVIP

////实例方法创建字符串

//NSString*str1=[[NSStringalloc]

initWithFormat:@helloworld];

//NSLog(@%@,str1);

//

////便利构造器方法创建字符串

//NSString*str2=[NSString

stringWithFormat:@hellolanou];

//NSLog(@%@,str2);

//

////获取字符串长度

//NSLog(@%lu,[str2length]);

//

////判断字符串是否已指定字符串开始

//if([str1hasPrefix:@hello]){

//NSLog(@没错就是hello开头);

//}else{

//NSLog(@不是以hello开始);

//}

////判断字符串是否以指定字符串结束

//if([str2hasSuffix:@lanou]){

//NSLog(@没错就是lanou结束);

//}else{

//NSLog(@不是以lanou);

//}

//

////有哪些信誉好的足球投注网站字符串范围

//NSRangerange=[str2

rangeOfString:@lanou];

//NSLog(@%@,NSStringFromRange(range));

//

////字符串截取

//NSRangerange1={0,7};

//NSString*sub1=[str1

substringWithRange:range1];

//NSLog(@%@,sub1);

//NSString*sub2=[str1

substringFromIndex:3];

//NSLog(@%@,sub2);

//NSString*sub3=[str1substringToIndex:7];

//NSLog(@%@,sub3);

//

//

//str1=[str1substringToIndex:5];

//NSLog(@%@,str1);

////字符串拼接

//NSString*str1=[NSString

stringWithFormat:@来一串];

////NSString*str2=[NSString

stringWithFormat:@%@%@,str1,@羊肉串];

////NSLog(@%@,str2);

//

//NSString*str2=[str1

stringByAppendingString:@羊肉串];

//NSLog(@%@,str2);

//

//NSString*str3=[str1

stringByAppendingString:str2];

//NSLog(@%@,str3);

//替换字符串

//NSString*str=[NSString

stringWithFormat:@文艺青年欢乐多];

////str=[str

stringByReplacingOccurrencesOfString:@文艺

withString:@2b];

////NSRangerange={1,2};

//str=