Objective-C / iPhone - 字符串替换

Question

如何删除以下NSString中的“＆amp; expires_in = 87131”：

显然，值87131可能会在未来发生变化，而且它也始终是字符串的最后一部分。

NSString *accessToken = @"136369349714439%7C2.nNIKZW8Z7Yw_aaaffqKv7lVFYJg__.86400.1301824800-705896566%7Cp-z9A68pJqTDNjEMj0TrHogc2bw&expires_in=87131";
NSString *newStr = [accessToken stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

Answer 1

对于'修复％7C字符'，请参阅NSString stringByReplacingPercentEscapesUsingEncoding

http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/stringByReplacingPercentEscapesUsingEncoding

Answer 2

如果字符串保证只有一个＆符号：

NSArray *components = [accessToken componentsSeparatedByString:@"&"];
accessToken = [components objectAtIndex:0];