iOS8数字键盘加左下角完成button的核心代码如下面：

- (void)addDoneButtonToNumPadKeyboard

{

UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];

if (systemVersion < 8.0){

doneButton.frame = CGRectMake(0, 163, 106, 53);

}else{

doneButton.frame = CGRectMake(0, SCREEN_SIZE.height-53, 106, 53);

}

doneButton.tag = NUM_PAD_DONE_BUTTON_TAG;

doneButton.adjustsImageWhenHighlighted = NO;

[doneButton setTitle:@"完毕" forState:UIControlStateNormal];

[doneButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

[doneButton addTarget:self action:@selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];

NSArray *windowArr = [[UIApplication sharedApplication] windows];

if (windowArr != nil && windowArr.count > 1){

UIWindow *needWindow = [windowArr objectAtIndex:1];

UIView *keyboard;

for(int i = 0; i < [needWindow.subviews count]; i++) {

keyboard = [needWindow.subviews objectAtIndex:i];

NSLog(@"%@", [keyboard description]);

if(([[keyboard description] hasPrefix:@"

UIView *doneButtonView = [keyboard viewWithTag:NUM_PAD_DONE_BUTTON_TAG];

if (doneButtonView == nil){

[keyboard addSubview:doneButton];

}

}

}

}

}

-(void)removeDoneButtonFromNumPadKeyboard

{

UIView *doneButton = nil;

NSArray *windowArr = [[UIApplication sharedApplication] windows];

if (windowArr != nil && windowArr.count > 1){

UIWindow *needWindow = [windowArr objectAtIndex:1];

UIView *keyboard;

for(int i = 0; i < [needWindow.subviews count]; i++) {

keyboard = [needWindow.subviews objectAtIndex:i];

if(([[keyboard description] hasPrefix:@"

doneButton = [keyboard viewWithTag:NUM_PAD_DONE_BUTTON_TAG];

if (doneButton != nil){

[doneButton removeFromSuperview];

}

}

}

}

}

注：

1.iOS8之后，键盘view的description变为以

2.iOS8之后。键盘view的大小变成了整个屏幕的大小。所以须要对button加入的位置进行适配。

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