利用通知监测键盘的移动，从而改变输入框的位置
-(void)dealloc
{
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
#pragma mark - UIKeyboardNotification
- (void)keyboardWillChangeFrame:(NSNotification *)notification
{
NSDictionary *userInfo = notification.userInfo;
CGRect endFrame = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect beginFrame = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
CGFloat duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
void(^animations)() = ^{
[self willShowKeyboardFromFrame:beginFrame toFrame:endFrame];
};
void(^completion)(BOOL) = ^(BOOL finished){
};
[UIView animateWithDuration:duration delay:0.0f options:(curve << 16 | UIViewAnimationOptionBeginFromCurrentState) animations:animations completion:completion];
}
- (void)willShowKeyboardFromFrame:(CGRect)beginFrame toFrame:(CGRect)toFrame
{
if (beginFrame.origin.y == [[UIScreen mainScreen] bounds].size.height){//将要移动的位置
[UIView animateWithDuration:0.3 animations:^{
_atextField.frame = RECTMAKE(0, CGRectGetHeight([self superview].frame)-CGRectGetHeight(self.frame)-toFrame.size.height+10, 320, 243);
} completion:^(BOOL finished) {
}];
}else if (toFrame.origin.y == [[UIScreen mainScreen] bounds].size.height){//初始位置
[UIView animateWithDuration:0.3 animations:^{
_atextField.frame.frame = RECTMAKE(0, CGRectGetHeight([self superview].frame)-CGRectGetHeight(self.frame), 320, 243);
}completion:^(BOOL finished) {
}];
}else{//将要移动的位置
[UIView animateWithDuration:0.3 animations:^{
_atextField.frame.frame = RECTMAKE(0, CGRectGetHeight([self superview].frame)-CGRectGetHeight(self.frame)-toFrame.size.height+10, 320, 243);
} completion:^(BOOL finished) {
}];
}
}