NSMutableString基础-初始化、赋值、替换、插入、删除、查找

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {
NSMutableString *mustr1=[[NSMutableString alloc]init];
NSMutableString *mustr2=[[NSMutableString alloc]initWithFormat:@"Hello"];
NSMutableString *mustr3=[[NSMutableString alloc]init];
//赋值
NSString *str1=@"Welcom to OC";
mustr1=[[NSMutableString alloc]initWithString:str1];
//NSMutableString *mustr3=@"Hello";     错误的赋值法，不能将字符串常量直接赋值给NSMutableString
//替换字符串
NSRange rang1=[mustr1 rangeOfString:@"OC"];
[mustr1 replaceCharactersInRange:rang1 withString:@"Objective-C"];
NSLog(@"mustr1=%@",mustr1);
//插入字符串
[mustr1 insertString:@" students" atIndex:6];   //在指定位置插入字符串
[mustr2 appendString:@" teacher!"];             //在末尾插入字符串
[mustr3 appendFormat:@"Hey!%@",str1];           //格式化插入字符串
NSLog(@"mustr1=%@,mustr2=%@,mustr3=%@",mustr1,mustr2,mustr3);
//指定位置删除字符串
[mustr1 deleteCharactersInRange:NSMakeRange(7, 9)];
NSLog(@"mustr1=%@",mustr1);
//查找删除字符串
NSRange rang2=[mustr2 rangeOfString:@" teacher"];
if(rang2.location!=NSNotFound){
[mustr2 deleteCharactersInRange:rang2];
}
NSLog(@"%@",mustr2);
//重新赋值
[mustr1 setString:str1];
NSLog(@"%@",mustr1);
}
return 0;
}