NSURL-没有可变子类，所以不需要“复制”作为属性？-NSURL-Nomutablesubclass,sononeedto“copy”asaproperty?

6  

The fact that Apple does not supply a mutable subclass does not mean that a malicious user could not build one specifically to trick your class. If you operate under the assumption that strings can be changed behind your class's back, you need to at least allow for a possibility of an ill-intentioned user extending NSURL into a mutable class:

Apple不提供可变子类这一事实并不意味着恶意用户无法专门构建一个欺骗您的类。如果你假设字符串可以在你的班级后面改变,你需要至少考虑到一个恶意用户将NSURL扩展到一个可变类的可能性:

@interface TrickThemURL : NSURL
    // override key properties, such as baseURL and host, to be mutable
@end

If a programmer gives you an object of TrickThemURL and you fail to copy it before the validation, that programmer is now free to change the URL without letting your class know.

如果程序员给你一个TrickThemURL的对象而你在验证之前没有复制它,那么程序员现在可以自由地更改URL而不让你的班级知道。

9  

With iOS7 you can use NSURLComponents, now it's very simple, look this examples:

使用iOS7,你可以使用NSURLComponents,现在它非常简单,看看这个例子:

NSString *urlString = @"https://mail.google.com/mail/u/0/?shva=1#inbox";
NSURLComponents *compOnents= [[NSURLComponents alloc] initWithString:urlString];

NSLog(@"%@ - %@ - %@ - %@", components.scheme, components.host, components.query, components.fragment);



NSURLComponents *compOnents= [NSURLComponents new];
[components setScheme:@"https"];
[components setHost:@"mail.google.com"];
[components setQuery:@"shva=1"];
[components setFragment:@"inbox"];
[components setPath:@"/mail/u/0/"];

[webview loadRequest:[[NSURLRequest alloc] initWithURL:[components URL]]];