IOS NSString字符串基本操作

//创建一个字符串常量NSString *string100=@\"这是一个常量，\";//创建一个空字符串NSString *string101=[[NSString alloc] init];NSString *string102=[NSString string];//快速创建字符串NSString *string103=[[NSString alloc] initWithString:@\"abc\"];NSString *string104=[NSString stringWithString:@\"def\"];//创建一个格式化的字符NSString *string105=[[NSString alloc] initWithFormat:@\"%d\" ,10];NSString *string106=[NSString stringWithFormat:@\"%f\",11.5];//字符串转换NSString *string107=@\"abc\";NSString *string108=@\"ABC\";NSLog(@\"uppercase:%@\",[string107 uppercaseString]);//打印出ABCNSLog(@\"lowercase:%@\",[string108 lowercaseString]);//打印出abcNSLog(@\"capitalized:%@\",[string107 capitalizedString]);//大写首字母//字符比较NSString *string109=@\"abc\";NSString *string111=[[NSString alloc] initWithFormat:@\"abc\"];if ([string109 isEqualToString:string111]) {NSLog(@\"相同内容\");}else{NSLog(@\"内容不同\");}if (string109 == string111) {//等号是指针NSLog(@\"内存指针相同\");}else{NSLog(@\"内存指针不同\");}//求字符串长度NSString * string112=[[NSString alloc] initWithFormat:@\"abcd\"];NSLog(@\"字符串长度：%hd\",[string112 length]);//拼接字符串NSString *string10=@\"abc\";NSString *string11=@\"def\";NSLog(@\"string10+string11:%@\",[string10 stringByAppendingFormat:@\"%@\",string11]);NSLog(@\"string0+string11:%@\",[string10 stringByAppendingString:string11]);NSLog(@\"string10+string11:%@\",[[NSString alloc] initWithFormat: @\"%@%@\",string10,string11]);//截取字符串NSString *string=[[NSString alloc] initWithString:@\"abcdefg\"];NSString *substring1=[string substringToIndex:2];NSString *substring2=[string substringFromIndex:2];NSRange range={2,4};NSLog(@\"rang:%@\",[string substringWithRange:range]);NSLog(@\"1:%@\",substring1);NSLog(@\"2:%@\",substring2);//查找字符串NSString *searchstring=[[NSString alloc] initWithString:@\"abcabcuu\"];NSRange aa=[searchstring rangeOfString:@\"uu\"];if (aa.location != NSNotFound) {NSLog(@\"searchstring:%@\",@\"aa\");}//可变字符串 NSMutableStringNSMutableString *string200=[[NSMutableString alloc] initWithFormat:@\"abc\" ];//插入[string200 insertString:@\"insert\" atIndex:0 ];NSLog(@\"insertstring:%@\",string200);//替换[string200 replaceCharactersInRange:NSMakeRange(1, 2) withString:@\"ddddddd\"];NSLog(@\"insertstring:%@\",string200);//删除[string200 deleteCharactersInRange:NSMakeRange(1, 2) ];NSLog(@\"insertstring:%@\",string200);

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