尝试达到下面的效果：
输入框输入字符，单击按钮改变label框的值：
ViewController.h
//代码效果参考：http://www.zidongmutanji.com/bxxx/431090.html
1 #import2
3 @interface ViewController : UIViewController
4
5 @property (nonatomic,assign) IBOutlet UITextField input1;
6 @property (nonatomic,assign) IBOutlet UILabel output1;
7
8
9 - (IBAction)click1;
10 @end
ViewController.m
1 #import "ViewController.h"
2
3 @interface ViewController ()
4
5 @end
6
7 @implementation //代码效果参考：http://www.zidongmutanji.com/zsjx/573773.html
ViewController8
9 - (void)viewDidLoad {
10 【super viewDidLoad】;
11 // Do any additional setup after loading the view, typically from a nib.
12 }
13
14 - (void)didReceiveMemoryWarning {
15 【super didReceiveMemoryWarning】;
16 // Dispose of any resources that can be recreated.
17 }
18 - (void)click1{
19 // NSString input1 = _input1.text;
20 // NSString output1 = _//代码效果参考：http://www.zidongmutanji.com/zsjx/295237.html
output1.text;21 // output1 = input1;
22 NSString input1 = _input1.text;
23 _output1.text = input1;
24 NSString output1 = _output1.text;
25
26
27 NSLog(@"test:%@,%@",input1,output1);
28
29
30 }
31
32 @end
click1方法里面我一开始是写的注释掉的3行，运行后正常打印，但是label的text值并未改变。原因是"output1 = input1"只是改变了output1指向 而已，使output1这个指向了input1所指向的地址，而_output1的set方法并不会被调用。好吧，我也不知道为什么开始会那样写orz.
