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。
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//// 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 beforeNSLog(@"Resizing smaller for keyboard"); // Get the origin of the keyboard when it finishes animatingNSDictionary *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 itCGRect 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 visibleNSLog(@"%@", @"Resizing bigger with no keyboard"); // Resize the scroll view back to the full size of our viewself.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 |
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原文链接：http://blog.sina.com.cn/s/blog_68edaff101019y2c.html
