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关于ios键盘遮挡输入框

2012-09-03 23:12 519 查看
今天我来讲一下键盘遮挡输入框时的解决方法。我做的一个界面是这样的



我的输入框是在最下面,如果不做相关的操作的话,当编辑UITextField的时候,弹出键盘就会挡着输入框,那怎么解决这个问题呢,我们可以考虑让输入框随键盘一起向上移动,当关闭键盘时让输入框也一起向下移动回到原来的位置,这样就可以解决键盘挡着输入框的问题啦

下面看具体的代码实现:

在ios5.0之前呢键盘高度固定是216像素高,而ios5.0之后包括ios5.0键盘的高度再不是固定的,当由英文切换在中文输入时,键盘由原来的216变成了252

先说ios5.0之前的解决办法吧,我是通过UITextField的委托方法-(void)textFieldDidBeginEditing:(UITextField *)textField和另一个关掉键盘的方法

- (BOOL)textFieldShouldReturn:(UITextField *)textField来实现的,点击键盘上的Return会关掉键盘的

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
CGRect frame = textField.frame;
int offset = frame.origin.y +422 - (self.view.frame.size.height - 240);//键盘高度216
NSLog(@"offset is %d",offset);
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
[UIView setAnimationDuration:animationDuration];
float width = self.view.frame.size.width;
float height = self.view.frame.size.height;
if(offset > 0)
{
CGRect rect = CGRectMake(0.0f, -offset,width,height);
self.view.frame = rect;
}
[UIView commitAnimations];
}


- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);
self.view.frame = rect;
[UIView commitAnimations];
[textField resignFirstResponder];
return YES;
}


对了在添加-(void)textFieldDidBeginEditing:(UITextField *)textField方法前要声明并设置delegate

另一个方法是针对ios5.0之后键盘高度随输入法不同变化时的解决办法,同时也适用于ios5.0之前

在-(void)viewDidLoad方法里面添加通知

if(IOS_VERSION<5.0)
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillHideNotification object:nil];
}else{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
}


至于如何获取IOS系统版本号通过如下可获取

#define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]


添加一个方法-(void)keyboardWillShow:(NSNotification *)notification具体如下

-(void)keyboardWillShow:(NSNotification *)notification
{

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_3_2
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
#endif
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_3_2
NSValue *keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
#else
NSValue *keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey];
#endif
CGRect keyboardBounds;
[keyboardBoundsValue getValue:&keyboardBounds];
NSInteger offset =self.view.frame.size.height-keyboardBounds.origin.y+64.0;
CGRect listFrame = CGRectMake(0, -offset, self.view.frame.size.width,self.view.frame.size.height);
NSLog(@"offset is %d",offset);
[UIView beginAnimations:@"anim" context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.3];
//处理移动事件,将各视图设置最终要达到的状态

self.view.frame=listFrame;

[UIView commitAnimations];

}
}




这个是编辑输入框时的效果



这个是键盘切换成中文输入法时的效果
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