NSURL总是返回零

Question

我有WCF服务,我想从我的网络服务获取数据.但URL始终返回nil.为什么？我想将参数发送到来自文本字段值的WCF.例如;

txtfield.text = @"ATA?EH?R";

怎么了 ？

NSString *request = [NSString stringWithFormat:@"http://www.xxxxxxxx.com/CCWCF.svc/MethodName/%@",txtfield.text];
NSURL *URL = [NSURL URLWithString:[request stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];

我尝试了不同的东西,但结果并没有改变.

NSURL *URL = [NSURL URLWithString:[NSString stringWithFormat:@"http://www.xxxxxxxx.com/CCWCF.svc/MethodName/%@",txtfield.text]];

要么:

NSURL *URL = [[NSURL alloc] initWithString:[request stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];

Answer 1

NSString* encodedText = [txtfield.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *request = [NSString stringWithFormat:@"http://www.xxxxxxxx.com/CCWCF.svc/MethodName/%@",encodedText];
NSURL *URL = [NSURL URLWithString:request];

另外,[NSString stringByAddingPercentEscapesUsingEncoding:]对于URL编码可能有点问题.使用更安全的方式Core Foundation.例如,请参阅http://madebymany.com/blog/url-encoding-an-nsstring-on-ios(找不到SO问题).