字符串的插入、删除、查找并删除、重新赋值、替换

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

@autoreleasepool {

//nsstring父类   NSMutableString可变字符串子类

NSMutableString *mustr=[[NSMutableString alloc]init];

NSMutableString *mustr1=[NSMutableString stringWithFormat:@"Hello"];

//将不可变的字符串放置到可变字符串内

NSString *[email protected]"welcome to oc";

mustr=[NSMutableString stringWithString:str];

//插入

[mustr insertString:@" students " atIndex:7];

[mustr appendString:@" teacher"];

[mustr appendFormat:@"第二遍插入:%@",str];

//删除

[mustr deleteCharactersInRange:NSMakeRange(8, 10)];

//查找并删除

NSRange rang=[mustr rangeOfString:@"第二遍插入:welcome to oc"];

if (rang.location!=NSNotFound) {

[mustr deleteCharactersInRange:rang];

}

//重新赋值

[mustr setString:str];

//替换

NSRange rang1=[mustr rangeOfString:@"oc"];

[mustr replaceCharactersInRange:rang1 withString:@"IOS"];

NSLog(@"%@",mustr);

}

return 0;

}