您如何在Objective-C中创建如下格式的字符串？

Question

I'm a newcomer to the iPhone world. (Previously, I've developed for android.)

I've got this code in one of my Android apps:

String body = "<Item type='Customer' id= '"+id+"'  action='delete'/>";

What's the same in Objective-C?

Answer 1

You can use -[NSString stringWithFormat:] :

NSString *body = [NSString stringWithFormat:@"<Item type='Customer' id='%@' action='delete'/>", idNum];

Assuming the ID is stored in the variable idNum . ( id is actually a type in Objective-C, so you don't want to use that as a variable name.)

Answer 2

As Henrik says, it's:

NSInteger id = 5;
NSString* body = [NSString stringWithFormat:@"<Item type='Customer' id= '%d'  action='delete'/>", i];

(A purist may argue with this, though.)

But really the answer is to read through " Learning Objective-C: A Primer ." It's not terribly long and shows you pretty much everything you need to know about the language.

Answer 3

String body = "<Item type='Customer' id= '"+id+"'  action='delete'/>";


NSString* id = @"foo";
NSString* body 
  = [NSString stringWithFormat:@"<Item type='Customer' id='%@' action='delete'/>", id ];