小编Sim*_*ise的帖子

在iOS 3中,此解决方法涉及创建客户UIButton并将其作为子视图添加到Apple键盘.当iOS 4发布时,子视图被添加到更改的视图.所以为了在iOS3和4中工作,我有以下内容.

-(void) addDoneButtonToNumericKeyboard {
if(doneButtonIsAdded) {
    return;
}
if(doneButtonForNumericKeyboard == nil) {
    doneButtonForNumericKeyboard= [[UIButton buttonWithType:UIButtonTypeCustom] retain];
    doneButtonForNumericKeyboard.frame = CGRectMake(0, 163, 106, 53);
    doneButtonForNumericKeyboard.adjustsImageWhenHighlighted = NO;
    if ([[[UIDevice currentDevice] systemVersion] hasPrefix:@"3"]) {
        [doneButtonForNumericKeyboard setImage:[UIImage imageNamed:@"DoneUp3.png"] forState:UIControlStateNormal];
        [doneButtonForNumericKeyboard setImage:[UIImage imageNamed:@"DoneDown3.png"] forState:UIControlStateHighlighted];
    } else {        
        [doneButtonForNumericKeyboard setImage:[UIImage imageNamed:@"DoneUp.png"] forState:UIControlStateNormal];
        [doneButtonForNumericKeyboard setImage:[UIImage imageNamed:@"DoneDown.png"] forState:UIControlStateHighlighted];
    }
    [doneButtonForNumericKeyboard addTarget:self action:@selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];
}
// locate keyboard view
NSArray *winArray = [[UIApplication sharedApplication] windows];
if(winArray == nil || [winArray count] < 2) {
    NSLog(@"No winArray found!"); …