iOS 防键盘遮挡的实例

当我们在UITextField输入数据时经常弹出键盘遮挡界面，解决方法是：在弹出键盘时将整个UIVIew向上移动，在键盘消失时，UIVIew还原。

实例代码如下：

@interface ViewController ()<UITextFieldDelegate>

@property(nonatomic,strong)UITextField* tf;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.tf = [[UITextField alloc]initWithFrame:CGRectMake(10, 600, 100, 20)];

self.tf.delegate = self;

self.tf.backgroundColor = [UIColor blackColor];

[self.view addSubview:self.tf];

}

#pragma mark life Circle

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

//后台切换到前台通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillEnterForeground)name:UIApplicationWillEnterForegroundNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWillHide:)

name:UIKeyboardWillHideNotification

object:nil];

[self.view endEditing:YES];

}

- (void)applicationWillEnterForeground{

[self.view endEditing:YES];

}

-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

[self.view endEditing:YES];

}

#pragma mark UITextFieldDelegate

-(void)textFieldDidBeginEditing:(UITextField *)textField{

//第一个cell不往上弹输入框的位置

// if(indexPath.row!=0){

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

// }

}

-(void)textFieldDidEndEditing:(UITextField *)textField{

}

#pragma mark 键盘操作

- (void)keyboardWillChange:(NSNotification *)note

{

NSDictionary *userInfo = note.userInfo;

CGFloat duration = [userInfo[@"UIKeyboardAnimationDurationUserInfoKey"] doubleValue];

CGRect keyFrame = [userInfo[@"UIKeyboardFrameEndUserInfoKey"] CGRectValue];

//这个64是我减去的navigationbar加上状态栏20的高度,可以看自己的实际情况决定是否减去;

CGFloat moveY = keyFrame.origin.y -self.tf.frame.origin.y-self.tf.frame.size.height;