Objective-C/iPhone - 字符串替换
我将如何删除以下 NSString 中的“&expires_in=87131”：
显然，值 87131 将来可能会发生变化，并且它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];
How would I go about removing the "&expires_in=87131" within the following NSString:
Obviously the value 87131 may change in the future and it's always the last part of the string as well.
NSString *accessToken = @"136369349714439%7C2.nNIKZW8Z7Yw_aaaffqKv7lVFYJg__.86400.1301824800-705896566%7Cp-z9A68pJqTDNjEMj0TrHogc2bw&expires_in=87131";
NSString *newStr = [accessToken stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
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如果保证字符串中只有一个 & 符号：
If the string is guaranteed to only have one ampersand in it:
有关“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
For 'fixing the %7C characters' see NSString stringByReplacingPercentEscapesUsingEncoding
http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/stringByReplacingPercentEscapesUsingEncoding