iOS解决键盘遮挡问题

(void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

for(int i = 0; i < 10; i++)

{

UITextField textF = [[UITextField alloc] initWithFrame:CGRectMake(20, 50 i + 50, 200, 45)];

textF.borderStyle = UITextBorderStyleRoundedRect;

textF.delegate = self;

textF.placeholder = [NSString stringWithFormat:@”第%d个textField”,i];

[self.view addSubview:textF];

}

//频道：UIKeyboardWillShowNotification 监听键盘即将升起

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

//键盘收起的时候

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHidden) name:UIKeyboardWillHideNotification object:nil];

}

(void)keyboardWillShow:(NSNotification *)noti

{

//键盘最后停止时候的高度

//得到键盘的信息

NSDictionary *dic = noti.userInfo;

//键盘停止时候的值

NSValue *keyBoardValue = [dic objectForKey:UIKeyboardFrameEndUserInfoKey];

//转为CGRect变量

CGRect keyBoardFrame = keyBoardValue.CGRectValue;

//1.获取textField底部y坐标

//2.算textField和键盘y坐标的差值

//差值代表被遮住的部分

NSInteger offset = _selectTextF.frame.origin.y + _selectTextF.frame.size.height - keyBoardFrame.origin.y;

//如果遮住

if (offset > 0) {

//视图上移动差值

self.view.frame = CGRectMake(0, -offset, self.view.frame.size.width, self.view.frame.size.height);

}

}

(void)keyboardWillHidden

{

//键盘即将下落的时候，让self.view回到起始位置

self.view.frame = self.view.bounds;

}

(void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event

{

[self.view endEditing:YES];

}

(BOOL)textFieldShouldBeginEditing:(UITextField *)textField

{

_selectTextF = textField;

return YES;

}