如何转义要在NSURL中使用的NSString？

Question

到目前为止我的发送按钮已获得此代码：

NSString* urlString = [NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding];
NSURL *add = [NSURL URLWithString:urlString];

但是我确实收到错误“预期”：'

Answer 1

您需要分开两个字符串构造调用

NSString* urlString = [[NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text] stringByAddingPercentEscapesUsingEncoding : NSUTF8StringEncoding];
NSURL *add = [NSURL URLWithString:urlString];

Answer 2

正确的方法是不要逃避整个网址。您应该只转义单个参数值。

NSString* urlString = [NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", [messageBox.text stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding]];

更好的是，为了便于阅读和调试，请执行以下操作：

NSString *escapedText = [messageBox.text stringByAddingPercentEscapesUsingEncoding:NSUFT8StringEncoding];
NSString* urlString = [NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", escapedText];

Answer 3

尝试：

NSString* urlString = [[NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text] stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding];

Answer 4

分开NSString方法以清楚地看到它：

NSString* urlString = [[NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text] stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding];

Answer 5

NSURL会在你调用NSURL urlWithString时自动对字符串进行url编码，不需要这段代码。