iOS 笔记-incompatible pointer types initializing 'NSMutableString *' with an expression of type 'NSString *'警告处理

记录下来，以防止再犯错

代码如下

NSString *userHeader = [userInfoDictionary objectForKey:@"photo"];
    NSMutableString *mutableuserHeader = [NSMutableString stringWithString:userHeader];
    //设置用户头像
    NSRange range = [mutableuserHeader rangeOfString:@".."];
    [mutableuserHeader replaceCharactersInRange:range withString:@"video"];
    NSMutableString *userHeaderInfo = [Port stringByAppendingString:mutableuserHeader];

红色字体部分出现的题目中的警告，经查实解决办法是把

NSMutableString换成

NSString
这样问题便迎刃而解~