通用方法解决UITextFiled输入的时候，键盘遮挡问题

我们在用键盘录入的时候，有可能会遮挡录入框，所以我们应调整UIView的位置，使其不被遮挡。我写了一个通用的方法可以解决这个问题：

 1 - (void)moveView:(UITextField *)textField leaveView:(BOOL)leave  
 2 {  
 3     UIView *accessoryView = textField.inputAccessoryView;  
 4     UIView *inputview     = textField.inputView;  
 5       
 6     int textFieldY = 0;  
 7     int accessoryY = 0;  
 8     if (accessoryView && inputview)   
 9     {  
10         CGRect accessoryRect = accessoryView.frame;  
11         CGRect inputViewRect = inputview.frame;  
12         accessoryY = 480 - (accessoryRect.size.height + inputViewRect.size.height);  
13     }  
14     else if (accessoryView)  
15     {  
16         CGRect accessoryRect = accessoryView.frame;  
17         accessoryY = 480 - (accessoryRect.size.height + 216);  
18     }  
19     else if (inputview)  
20     {  
21         CGRect inputViewRect = inputview.frame;  
22         accessoryY = 480 -inputViewRect.size.height;  
23     }  
24     else  
25     {  
26         accessoryY = 264; //480 - 216;  
27     }  
28       
29       
30     CGRect textFieldRect = textField.frame;  
31     textFieldY = textFieldRect.origin.y + textFieldRect.size.height + 20;  
32       
33     int offsetY = textFieldY - accessoryY;  
34     if (!leave && offsetY > 0)   
35     {  
36         int y_offset = -5;  
37           
38         y_offset += -offsetY;  
39           
40         CGRect viewFrame = self.view.frame;  
41           
42         viewFrame.origin.y += y_offset;  
43           
44         [UIView beginAnimations:nil context:NULL];  
45         [UIView setAnimationBeginsFromCurrentState:YES];  
46         [UIView setAnimationDuration:0.3];  
47         [self.view setFrame:viewFrame];  
48         [UIView commitAnimations];  
49     }  
50     else  
51     {  
52         CGRect viewFrame = CGRectMake(0, 20, 320, 460);  
53           
54         [UIView beginAnimations:nil context:NULL];  
55         [UIView setAnimationBeginsFromCurrentState:YES];  
56         [UIView setAnimationDuration:0.3];  
57         [self.view setFrame:viewFrame];  
58         [UIView commitAnimations];  
59     }  
60 }  

[代码] 用法很简单，在UITextFieldDelegate的两个方法里分别调用一下这个方法就ＯＫ了，如下示例：

1 - (void)textFieldDidBeginEditing:(UITextField *)textField  
2 {  
3         [self moveView:textField leaveView:NO];  
4 }  
5   
6 - (void)textFieldDidEndEditing:(UITextField *)textField;  
7 {  
8     [self moveView:textField leaveView:YES];  
9 }