stringByAppendingPathComponent和stringByAppendingPathExtension区别

• stringByAppendingPathComponent是添加/号，使之变成一个完整的路径

NString * str=@“tmp”;
str=[stringByAppendingPathComponent:@"hello.png"];
//str就变成 tmp/hello.png了

• stringByAppendingPathExtension 是加后缀的意思

NString * str=@“str”;
str=[str stringByAppendingPathExtension:@"jpg"];
//str就是 str.jpg 

原文链接,本文只是对原文进行了排版.