如何通过按子视图中的按钮删除以编程方式创建的子视图

Question

我目前有一个按钮：

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(doneDate:)];

它会调用以下操作：

- (IBAction)doneDate:(id)sender{
[self removeDateView]
}

调用以下方法：

- (void)removeDateView{

NSLog(@"subviews of view3.view: %@",self.View3.subviews);
[self.View3.subviews. makeObjectsPerformSelector: @selector(removeFromSuperview)];

}

我试图删除的子视图是

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44.0 + 210)];

目前它只删除了该视图中的所有内容，我似乎无法删除名为containerView的视图，该视图具有日期选择器和工具栏。

Answer 1

正如erhnby所说，你可以使用一个标签 - 这是一个很好的方法，但我总是尽量避免在我可以的情况下循环浏览视图的子视图。就个人而言，我会让视图你要删除一个实例变量，当你想要删除它时，你可以直接调用它删除...只是做了一个简单的例子：

.h文件：

#import <UIKit/UIKit.h>

@interface TestViewController : UIViewController {
    UIView *_containerView;
}

@end

.m文件：

#import "TestViewController.h"

@interface TestViewController ()

@end

@implementation TestViewController

- (id)init {
    self = [super init];

    // create the bar button and set it as the right bar button on the navigation bar
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(removeDoneDate)];

    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    // create the container view and add it as a subview
    _containerView = [[UIView alloc] initWithFrame:CGRectMake(20, 100, 100, 100)];
    _containerView.backgroundColor = [UIColor redColor];
    [self.view addSubview:_containerView];

}

- (void)removeDoneDate {
    // remove it
    [_containerView removeFromSuperview];
}

@end

结果开始：

按按钮......

（抱歉，没有意识到白色的白色会很难看到）

Answer 2

为此设置标记将删除视图

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44.0 + 210)];
[containerView setTag:100];

找到它并removeFromSuperView

for (UIView*  view in self.View3.subviews) {
        if ([view isKindOfClass:[UIView class]] && view.tag == 100) {
            [view removeFromSuperview];
        }
    }