IOS 字符串常用处理详细介绍

ios 字符串常用处理详细介绍

nsstring *tempa = @"123";
 nsstring *tempb = @"456";

1，字符串拼接

 nsstring *newstring = [nsstring stringwithformat:@"%@%@",tempa,tempb];

2，字符转int

int intstring = [newstring intvalue];

3，int转字符

nsstring *stringint = [nsstring stringwithformat:@"%d",intstring];

4，字符转float

 float floatstring = [newstring floatvalue];

5，float转字符

nsstring *stringfloat = [nsstring stringwithformat:@"%f",intstring];

6.截取字符串

nsstring*string =@"sdfsfsfsadfsdf";
string = [string substringtoindex:7];//截取下标7之后的字符串
nslog(@"截取的值为：%@",string);
[string substringfromindex:2];//截取下标2之前的字符串
nslog(@"截取的值为：%@",string);

7.匹配字符串

nsstring*string =@"sdfsfsfsadfsdf";
nsrangerange = [stringrangeofstring:@"f"];//匹配得到的下标
nslog(@"rang:%@",nsstringfromrange(range));
string = [string substringwithrange:range];//截取范围类的字符串
nslog(@"截取的值为：%@",string);

8.分隔字符串

nsstring*string =@"sdfsfsfsadfsdf";
nsarray *array = [string componentsseparatedbystring:@"a"]; //从字符a中分隔成2个元素的数组
nslog(@"array:%@",array); //结果是adfsfsfs和dfsdf

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