iOS键盘遮挡（ios键盘遮挡输入框）

IOS NSNotification 键盘遮挡问题的解决办法

从键盘通知中获得键盘尺寸

键盘尺寸存在于NSNotification中。

1；在AddDrinkViewController中添加keyboardDidShow和keyboardDidHide方法

2；在viewWillAppear中注册UIKeyboardDidshowNotification与UIKeyboardDidHideNotification。

3；在viewWillDisappear中取消对所有事件的订阅注册

4；在AddDrinkViewController中添加一个Bool成员，跟踪键盘是否可见的状态。

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 // // ViewController.h // scrol // // Created by gao wuhang on 12-12-5. // Copyright (c) 2012年 gao wuhang. All rights reserved. // #import @interface ViewController : UIViewController{ BOOL keyboardVisible; UIScrollView *scrollView; } - (void)keyboardDidShow: (NSNotification*) notif; - (void)keyboardDidHide: (NSNotification*) notif; @property (nonatomic, retain) UIScrollView *scrollView; @end // // ViewController.m // scrol // // Created by gao wuhang on 12-12-5. // Copyright (c) 2012年 gao wuhang. All rights reserved. // #import "ViewController.h" @interface ViewController () @end @implementation ViewController @synthesize scrollView; - (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil]; } - (void)viewWillDisappear:(BOOL)animated{ [[NSNotificationCenter defaultCenter] removeObserver:self]; } - (void) keyboardDidShow:(NSNotification *)notif { NSLog(@"%@", @"Received UIKeyboardDidShowNotification"); if (keyboardVisible) { NSLog(@"%@", @"Keyboard is already visible. Ignoring notifications."); return; } // The keyboard wasn't visible before NSLog(@"Resizing smaller for keyboard"); // Get the origin of the keyboard when it finishes animating NSDictionary *info = [notif userInfo]; NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey]; // Get the top of the keyboard in view's coordinate system. // We need to set the bottom of the scrollview to line up with it CGRect keyboardRect = [aValue CGRectValue]; keyboardRect = [self.view convertRect:keyboardRect fromView:nil]; CGFloat keyboardTop = keyboardRect.origin.y; // Resize the scroll view to make room for the keyboard CGRect viewFrame = self.view.bounds; viewFrame.size.height = keyboardTop - self.view.bounds.origin.y; self.scrollView.frame = viewFrame; keyboardVisible = YES; } - (void) keyboardDidHide:(NSNotification *)notif { NSLog(@"%@", @"Received UIKeyboardDidHideNotification"); if (!keyboardVisible) { NSLog(@"%@", @"Keyboard already hidden. Ignoring notification."); return; } // The keyboard was visible NSLog(@"%@", @"Resizing bigger with no keyboard"); // Resize the scroll view back to the full size of our view self.scrollView.frame = self.view.bounds; keyboardVisible = NO; } - (void)viewDidLoad { scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)]; // scroll.contentSize = CGSizeMake(1000, 1000); [self.view addSubview:scrollView]; // UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; // [button setBackgroundColor:[UIColor blackColor]]; // [scroll addSubview:button]; UITextView *textView = [[UITextView alloc]initWithFrame:CGRectMake(100, 300, 100, 100)]; textView.text = @"222"; textView.font = [UIFont systemFontOfSize:20]; [scrollView addSubview:textView]; [super viewDidLoad]; [textView release]; self.scrollView.contentSize = self.view.frame.size; // Do any additional setup after loading the view, typically from a nib. } - (void)dealloc { [scrollView release]; [super dealloc]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end