Objective-C：修剪空白

Question

我必须遗漏一些东西。我正在尝试修剪从数组中提取的数据但我的应用程序在trim方法上崩溃了。

                //pull values
 NSString* thisXStr = [thisSetArray objectAtIndex:0];
 NSString* thisYStr = [thisSetArray objectAtIndex:1];

 //cleaning up all the white space
 NSString *thisXStrTrim = [thisXStr stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
 NSString *thisYStrTrim = [thisYStr stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];

Answer 1

尝试制作数组对象的副本： NSString * thisXStr = [NSString stringWithString：[thisSetArray objectAtIndex：0]]; ...

Answer 2

废话，没关系，NSLog上的愚蠢语法错误...