如何将变量附加到xcode中的字符串

Question

我试图将变量附加到字符串但它显示错误。我在这里遗漏了一些非常容易的东西，但我的思绪却被枪毙了。

NSString *eID = [entertainmentArticle objectForKey:@"eID"];

NSURL *urla = [NSURL URLWithString:@"http://www.mydomain.com/iostest/appPHPs/schedule.php?eID=",eID];

Answer 1

只能在它们之间加一个逗号来连接2个字符串变量。试试这个：

NSURL *urla = [NSURL URLWithString:[NSString stringWithFormat:@"http://www.mydomain.com/iostest/appPHPs/schedule.php?eID=%@",eID]];

Answer 2

如果你要做的就是追加，你有几个选择：

一个。使用NSString＆amp; stringWithFormat：

NSString *eID = [entertainmentArticle objectForKey:@"eID"];
NSString *urlString = [NSString stringWithFormat:@"http://www.mydomain.com/iostest/appPHPs/schedule.php?eID=%@", eID];
NSURL *urla = [NSURL URLWithString:urlString];

B中。使用NSString＆amp; stringByAppendingString：

NSString *eID = [entertainmentArticle objectForKey:@"eID"];
NSString *baseUrl = @"http://www.mydomain.com/iostest/appPHPs/schedule.php?eID=";
NSString *urlString = [baseUrl stringByAppendingString:eID];
NSURL *urla = [NSURL URLWithString:urlString];

℃。使用NSMutableString＆amp; appendString：

NSString *eID = [entertainmentArticle objectForKey:@"eID"];    
NSString *baseUrl = @"http://www.mydomain.com/iostest/appPHPs/schedule.php?eID=";
NSMutableString *urlString = [NSMutableString stringWithString:baseUrl];
[urlString appendString:eID];
NSURL *urla = [NSURL URLWithString:urlString];

Answer 3

试试这样： -

NSString *eID = [entertainmentArticle objectForKey:@"eID"];

 NSString *url=@"http://www.mydomain.com/iostest/appPHPs/schedule.php?eID=";

NSURL *urla = [NSURL URLWithString:[url stringByAppendingString:eID];