Question

当我点击按钮时，我只获得了一个额外的视图，但我想要一个动态添加视图的点击次数，（比如for循环）...请帮我这个代码，谢谢你预先下，这只是我的代码的一部分

if (boolVal == true) {
    CGRect newFrameC = CGRectMake(_centreView.frame.origin.x, _centreView.frame.origin.y, _centreView.frame.size.width, 50);
    CGRect newFrameL1 = CGRectMake(_label2.frame.origin.x, _label2.frame.origin.y+50, _label2.frame.size.width, 50);
    _centreView.frame = newFrameC;
    _label2.frame = newFrameL1;
    boolVal = false;
}else if (boolVal == false){
    CGRect newFrameC = CGRectMake(_centreView.frame.origin.x, _centreView.frame.origin.y, _centreView.frame.size.width, 1);
    CGRect newFrameL1 = CGRectMake(_label2.frame.origin.x, _label2.frame.origin.y-50, _label2.frame.size.width, 50);
    _centreView.frame = newFrameC;
    _label2.frame = newFrameL1;
    boolVal = true;
}

Answer 1

<强> DummyViewController.m

#import "DummyViewController.h"
#import "ExtraView.h"

@interface DummyViewController ()

@property (nonatomic) unsigned int numberOfExtraViews;
@property (nonatomic, strong) NSMutableArray<ExtraView*>* extraViews;
@property (nonatomic, strong) UILabel* label1;
@property (nonatomic, strong) UILabel* label2;

@end

@implementation DummyViewController

-(void) removeExtraViews{
    for (ExtraView* extraView in _extraViews){
        [extraView removeFromSuperview];
    }
    [_extraViews removeAllObjects];
}

-(CGRect) getExtraViewFrame{
    CGRect extraViewFrame = _label1.frame;
    if (_numberOfExtraViews > 0) {
        extraViewFrame = [_extraViews lastObject].frame;
    }
    extraViewFrame.origin.x += extraViewFrame.size.height;
    return extraViewFrame;
}

- (void) addExtraViews{
    //[self removeExtraViews];
    int numberOfExtraViewsToDraw = _numberOfExtraViews - _extraViews.count;

    for (int iterator = 0; iterator < numberOfExtraViewsToDraw; iterator ++){
        CGRect extraViewFrame = [self getExtraViewFrame];
        ExtraView *extraView = [[ExtraView alloc]initWithFrame:extraViewFrame];
        [self.view addSubview:extraView];
        [_extraViews addObject:extraView];
    }

    if (numberOfExtraViewsToDraw > 0) {
        CGRect label2Frame = [_extraViews lastObject].frame;
        label2Frame.origin.x += label2Frame.size.height;
        _label2.frame = label2Frame;
    }

}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self addExtraViews];
    //rest of your code
}

//Use this code in initWithNib/initWithCoder. Don't copy paste the same
-(instancetype)init{
    self = [super init];
    if (nil != self){
        _numberOfExtraViews = 0;
        _extraViews = [[NSMutableArray alloc]init];
    }
    return self;
}

//the function that gets hit when the button is tapped.
- (void) onButtonTap{
    _numberOfExtraViews++;
    [self.view setNeedsDisplay];
}

请注意以下事项：

我不明白boolVal是什么，但是如果它在点击按钮时不停地翻转，你将永远不会有多个视图。我认为它会切换，所以我根本没用过它。
在initWithNib / initWithCoder中使用init代码。别复制粘贴。不要覆盖给定的代码。只需附加到当前的init。
在我的代码中，onButtonTap是点击按钮时被点击的功能。

我已经通过确保viewDidLoad方法获得了agin来完成它。但我认为这不是必要的。你也可以这样做：

//the function that gets hit when the button is tapped.
- (void) onButtonTap{
    _numberOfExtraViews++;
    [self addExtraViews];
}

已完成的工作：

让我将您称之为centerView的内容称为extraView。会有很多额外的视图，所以我会为同一个（extraViews）创建一个数组。
视图数量的计数存储在numberOfExtraViews中。在init。中启动为0。
每当点击按钮时，我们都会增加计数并调用视图的setNeedsDisplay，后者又会点击viewDidLoad方法
在viewDidLoad中，我们添加了extraViews。

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