iphone - 以编程方式创建新的 UI 元素

Question

例如，当用户触摸按钮时，我希望能够创建元素（如 UIViews）

NSMutableString *myVar = [NSMutableString stringWithFormat:@"_view%i", num];
UIView * newView = [self valueForKey:myVar];

但没有添加所有

UIView * _view1;
UIView * _view2;
...

在 .h 文件中（如果可能的话..）

Answer 1

您可以使用 NSMutableArray 来保存它们。每次创建新视图时，只需将其添加到数组中。

Answer 2

这是应该做你想做的事情的示例代码。

@interface MyViewController ()

@property (strong, nonatomic) NSMutableArray *listChildViews;

@end

@implementation MyViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.listChildViews = [[NSMutableArray alloc] init];
}

- (IBAction)addChildViewTapped:(id)sender
{
    int numChildViews = [self.listChildViews count];

    ++numChildViews;

    // add new child view
    NSString *labelForNewView = [NSString stringWithFormat:@"view %d", numChildViews];

    CGFloat labelHeight = 28.0;

    UILabel *childView = [[UILabel alloc] initWithFrame:CGRectMake(10, numChildViews*labelHeight, 120.0, labelHeight)];
    childView.text = labelForNewView;
    [self.listChildViews addObject:childView];
    [self.view addSubview:childView];
}

@end

Answer 3

这是保罗答案的代码实现：

- (IBAction)userTouchedButton:(id)sender{
    for (int i = 0; i < 100; i++) {
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(x, y, width, height)];
        [view setBackgroundColor:[UIColor redColor]];//to distinguish theseViews from other views
        [view setTag:i];//to identified it later
        [_array insertObject:view atIndex:i];// globleMutble array
        [self.view addSubview:view];
    }
}

Answer 4

您无需在.h文件中添加您的视图。只需在添加它们之前和添加它们的位置进行实例化

-(void) addButton
{
UIView *view = [self view];
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button1 setTitle:@"My Button" forState:UIControlStateNormal];

UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 50, 0, 0)];
[myLabel setText:@"My Label"];

[button1 sizeToFit];
[myLabel sizeToFit];

[view addSubview:button1];
[view addSubview:myLabel];
}