/--------操作字符串--NSString(静态字符串)---------------------
NSString * a = @"a+b+c+a+b+d";
NSArray * m = [a componentsSeparatedByString:@"+"];//字符串根据某个字串拆分
NSRange x = [a rangeOfString:@"b"];//查找子字符串在总字符串的范围
NSLog(@"%lu, %lu", x.location , x.length);
NSString * r = [a stringByReplacingOccurrencesOfString:@"+" withString:@"-"];//把某个字符串替换成另一个字符串
NSLog(@"%@", r);
NSString * str = @"wo shi xiao hong jun!";
NSString * result = [str uppercaseString];//小写字母变成大写
NSLog(@"%@", result);
NSString * result1 = [str capitalizedString];//第一个单词变成大写
NSLog(@"%@", result1);
NSString * result2 = [result lowercaseString];//大写字母改为小写
NSLog(@"%@", result2);
NSString * Beijing= @"河南"; //字符串的声明
NSString * log=@"河南欢迎您a"; //[NSString stringWithFormat:@"I am '%@'", Beijing]; //字符串格式化
NSString * zhui = [Beijing stringByAppendingString:@"啦啦啦"]; //字符串追加
bool b=[Beijing isEqualToString:log]; //字符串比较
NSString * hh = @"http://www.cnblog.com";
if([hh hasPrefix:@"http"]){ //查找以http开头的字符串
NSLog(@"含有http");
}else{
NSLog(@"没有http");
}
NSString * ss = @"123";
int a = [ss intValue]; //字符串转int型
double dd = [ss doubleValue]; //字符串转double型
NSLog(@"%g", dd);
//字符串转数组
NSString * zifuchuan =@"one, two, three, four";
NSLog(@"string:%@", zifuchuan);
NSArray * array = [zifuchuan componentsSeparatedByString:@","];//用,把字符分成数字元素
// NSLog(@"array:%@", array); //输出整个数组中所有元素
NSString * value = [array objectAtIndex:0]; //取出第0个元素
NSLog(@"value:%@", value);
//数组转字符串
NSString * zifuchuan2 = [array componentsJoinedByString:@","];//用,把各个数字组成字符串
NSLog(@"zifuchuan2:%@", zifuchuan2);
//-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)];//0带表下标,4表示长度
NSLog(@"string2:%@",string2);
//--------操作动态字符串--NSMutableString----------------------------------------------------
NSMutableString * mstr = [[NSMutableString alloc] init];
NSString * str1 = @"This is a example.";
//创建可变字符串
mstr = [NSMutableString stringWithString:str1];
//插入字符
[mstr insertString:@"very easy " atIndex:10];
//删除一些字符
[mstr deleteCharactersInRange:NSMakeRange(10,5)];
//查找并删除
NSRange substr = [mstr rangeOfString:@"example"]; //字符串查找,可以判断字符串中是否有
if (substr.location != NSNotFound) {
[mstr deleteCharactersInRange:substr];
}
//重新设置字符串
[mstr setString:@"This is string AAA"];
//替换字符串
[mstr replaceCharactersInRange:NSMakeRange(15, 2) withString:@"BBB"]; //从第15个字符串处替换掉后2个字符串
//查找第一个并替换
NSString * search = @"This is";
NSString * replace = @"An example of";
substr = [mstr rangeOfString:search];
if (substr.location != NSNotFound) {
[mstr replaceCharactersInRange:substr withString:replace]; //把第1个遇到的substr替换为replace
NSLog(@"%@", mstr);
}
//查找全部匹配的，并替换
search = @"a";
replace = @"X";
substr = [mstr rangeOfString:search];
while (substr.location != NSNotFound) {
[mstr replaceCharactersInRange:substr withString:replace];
substr = [mstr rangeOfString:search];
}
NSLog(@"%@", mstr);