处理键盘升起后对界面覆盖问题的处理

大家在开发app的时候，界面中时常会有输入框（UItextfield,UItextview），这时我们点击输入框时会吊起键盘，根据手机屏幕不同我们的键盘会不同程度上覆盖界面上的部分控件，包括有无nav时坐标的变化与处理都会不同。所以本文就是针对此问题作了处理，基本上的常见的键盘引起的问题此demo应该都可以解决.
下面直接上代码，首先是.h中的一些申明:

<span style="font-family: Arial, Helvetica, sans-serif;">#define SCREEN_WIDTH    ([UIScreen mainScreen].bounds.size.width</span>

#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)

@interface ZTKeyboardVC : UIViewController<UITextFieldDelegate,UIScrollViewDelegate,UITextViewDelegate>

@property(nonatomic,strong)UIView*temView;
@property(nonatomic,assign)CGRect temRect;//记录输入框的坐标
@property(nonatomic,assign)CGRect temRect2;//记录scrollview的坐标
@property(nonatomic,assign)CGRect temRect3;//记录self.view的坐标
@property(nonatomic,assign) CGFloat temY;//记录scrollview改变偏移的前一次Y偏移
@property(nonatomic,assign) CGFloat temHeight;//记录处理有无nav的屏高
@property(nonatomic,assign)CGPoint temPoint;//记录contoffset
@property(nonatomic,assign) int keyHeight;//键盘高度
@property(nonatomic,assign) int mark;//记录高度差值
@property(nonatomic,assign) BOOL Show;//标记键盘是否升起
@property(nonatomic,assign) CGFloat offsetY;//scrollview的Y偏移量
@property(nonatomic,strong)NSArray*textArr;//输入框对象的集合
@property(nonatomic,strong)UIScrollView*temScroll;
@property(nonatomic,strong)UITapGestureRecognizer *recognizer;

+(void)loadWithSuperVC:(UIViewController*)VC WithScrollview:(UIScrollView*)scrollview :(NSArray*(^)())Input;

@end

重点在.m 中

-(NSArray*)textArr//这里是懒加载
{
if (_textArr==nil) {
_textArr=[NSArray new];
}

return _textArr;
}

#pragma mark--调用此类方法触发坐标升降变换
+(void)loadWithSuperVC:(UIViewController*)VC WithScrollview:(UIScrollView*)scrollview :(NSArray*(^)())Input
{
ZTKeyboardVC*ZT=[ZTKeyboardVC new];
[VC addChildViewController:ZT];
[ZT AddObserverForKeyboard1];
[ZT AddObserverForKeyboard0];
ZT.textArr=Input();

for (int i=0; i<ZT.textArr.count; i++) {
if ([ZT.textArr[i] isKindOfClass:[UITextView class]]) {
UITextView*txtview=ZT.textArr[i];
txtview.delegate=ZT;

}
if ([ZT.textArr[i] isKindOfClass:[UITextField class]]){
UITextField*txtfield=ZT.textArr[i];
txtfield.delegate=ZT;

}

}

if (VC.navigationController.navigationBar.frame.size.height) {//有nav的处理
ZT.temHeight=SCREEN_HEIGHT-64;
}
else
ZT.temHeight=SCREEN_HEIGHT;

if (scrollview) {

ZT.offsetY=0;
ZT.temScroll=scrollview;
ZT.temScroll.delegate=ZT;
ZT.temRect2=ZT.temScroll.frame;

}
else{

// NSLog(@"PP=%f",VC.navigationController.navigationBar.frame.size.height);
ZT.temView=VC.view;
if (VC.navigationController.navigationBar.frame.size.height) {
ZT.temRect3=CGRectMake(VC.view.frame.origin.x, VC.view.frame.origin.y+64, VC.view.frame.size.width, VC.view.frame.size.height);
}
else
ZT.temRect3= VC.view.frame;
}

}

下面看一些scroll与textfield的代理方法,这个demo是分为有无scroll来处理的

#pragma mark--不减速停止，此时手指离开立刻停止
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
_offsetY=scrollView.contentOffset.y;
}

#pragma mark--减速停止，此时手指离开时还在滚动
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
_offsetY=scrollView.contentOffset.y;
}

#pragma mark--textView输入框将要编辑时调用
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{

_temRect=textView.frame;
_temY=_temScroll.contentOffset.y;

if (_Show) {

NSLog(@"ppppppp");
[self changeframeForshow];
}
return YES;
}

#pragma mark--textView按ruturn，键盘消失
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text
{
if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}

#pragma mark--textField按ruturn，键盘消失
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{

[textField resignFirstResponder];
return YES;
}

#pragma mark--textField输入框开始编辑时调用
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
_temY=_temScroll.contentOffset.y;
_temRect=textField.frame;

if (_Show) {

[self changeframeForshow];

}

}

键盘通知注册与移除以及通知触发时事件的处理

#pragma mark--注册通知(事件即将发生)
-(void)AddObserverForKeyboard0
{

//增加监听，当键盘出现或改变时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];

//增加监听，当键退出时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}

#pragma mark--注册通知(事件已经发生)
-(void)AddObserverForKeyboard1
{
//增加监听，当键盘已经出现或改变时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardDidShow)
name:UIKeyboardDidShowNotification
object:nil];

//增加监听，当键已经退出时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardDidHide)
name:UIKeyboardDidHideNotification
object:nil];

_Show=NO;
}

-(void)keyboardDidShow
{
_Show=YES;
}

-(void)keyboardDidHide
{
_Show=NO;
[self changeframeForhide];
}

#pragma mark--改变坐标
-(void)changeframeForshow
{

if (!_temScroll) {
_mark=-_keyHeight+(_temHeight-CGRectGetMaxY(_temRect));
if (_mark<0) {

[UIView animateWithDuration:0.4 animations:^{

_temView.frame=CGRectMake(_temRect3.origin.x,_temRect3.origin.y+_mark-0.5 , _temRect3.size.width, _temRect3.size.height);

}];

}

}
else{//有scrollview
_offsetY=_temY;
_mark=-_keyHeight+(_temHeight-CGRectGetMaxY(_temRect))+_offsetY;
NSLog(@"mark==%i",_mark);
if (_mark<0) {

aff0
[UIView animateWithDuration:0.2 animations:^{
_temScroll.contentOffset=CGPointMake(0, _offsetY-_mark);
}];

}

}

}

-(void)changeframeForhide
{
if (_temScroll==nil) {

[UIView animateWithDuration:0.5 animations:^{

_temView.frame=_temRect3;
}];
}
else{

_temScroll.contentOffset=CGPointMake(0, 0);//回归
_offsetY=0;

}

}

#pragma mark--键盘升起
- (void)keyboardWillShow:(NSNotification *)aNotification
{

//获取键盘的高度
NSDictionary *userInfo = [aNotification userInfo];
NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = [aValue CGRectValue];
_keyHeight = keyboardRect.size.height;
NSLog(@"键盘高度=%i",_keyHeight);
[self changeframeForshow];

}

#pragma mark--键盘退出
- (void)keyboardWillHide:(NSNotification *)aNotification
{
[self changeframeForhide];

}

-(void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];
}

代码中我已经详细的注释了,各位有问题请留言！！