使用 UIScrollView 自定义 UIView 子类

Posted 2023-03-13

【中文标题】使用 UIScrollView 自定义 UIView 子类

【英文标题】：Custom UIView subClass with UIScrollView

【发布时间】：2016-01-08 16:41:49

【问题描述】：

我正在创建一个类，它创建一个选项栏，其中包含多个可通过按钮访问的滚动视图。

这就是我添加子视图及其内容的方式：

NSArray *scroll1 = [NSArray arrayWithObjects:@"normal",@"tiltshift",@"zoom",@"normal",@"blur",@"outline",@"coming soon", nil];
NSArray *scroll2 = [NSArray arrayWithObjects:@"Emoji Natur-01",@"Emoji Natur-02",@"Emoji Natur-03",@"Emoji Natur-04",@"Emoji Natur-05",@"Emoji Natur-06",@"Emoji Natur-07",@"Emoji Natur-08",@"Emoji Natur-09",@"Emoji Natur-10",@"Emoji Natur-11",@"Emoji Natur-12", nil];
NSArray *scroll3 = [NSArray arrayWithObjects:@"Linear",@"Parallel",@"Parallel 2",@"Crescendo",@"Dubstep",@"Blackhole",@"coming soon", nil];
NSArray *content = [NSArray arrayWithObjects:scroll1,scroll2,scroll3, nil];

[self.view addSubview:[self.bottomOptionView initWithFrame:self.view.frame withContent:content]];

然后子类为每个数组生成一个滚动视图，按钮基于数组的内容：

-(void)addScrollViewOfContent:(NSArray*)array

int viewNumber = array.count;

for (int i = 0 ; i < viewNumber; i++) 

    //create the main buttons
    NSArray *content = array[i];

    UIButton *buttonAccess = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    CGFloat buttonEdge = 40;
    CGFloat buttonSpace = self.frame.size.width /viewNumber;
    int placeOfButton = i+1;
    CGFloat buttonAnchor = ((placeOfButton*(buttonSpace)) - (buttonSpace /2+ buttonEdge/2));
    buttonAccess.frame = CGRectMake(buttonAnchor,  0 , buttonEdge, buttonEdge);

    [buttonAccess setBackgroundColor:[UIColor redColor]];

    buttonAccess.tag = i;
    [buttonAccess addTarget:self action:@selector(buttonAccess:) forControlEvents:UIControlEventTouchDown];
    [self addSubview:buttonAccess];

    UIScrollView *ScrollView = [[UIScrollView alloc]init];
    ScrollView.frame = CGRectMake(0, 50, self.frame.size.width, self.frame.size.height);
    ScrollView.showsHorizontalScrollIndicator = YES;
    ScrollView.tag = i;

    ScrollView.backgroundColor =[UIColor colorWithRed:0 green:0.0 blue:0.0 alpha:0.0];
    ScrollView.indicatorStyle = UIScrollViewDecelerationRateNormal ;
    //UIImageView *selector = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"FILTER_SELECT.png"]];

    CGFloat btnX = 0;
    for (int i = 0 ; i < content.count; i++)
    
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        button.frame = CGRectMake(btnX, 2 , 65, 65);

        UIImage *img = [UIImage imageNamed:[content objectAtIndex:i]];
        [button setBackgroundImage:img forState:UIControlStateNormal];
        [button addTarget:self action:@selector(subButtonTarget:) forControlEvents:UIControlEventTouchDown];
        button.tag = i;
        [button setTitle:[content objectAtIndex:i] forState:UIControlStateNormal];
        button.titleLabel.font = [UIFont fontWithName:@"MyriadPro-Cond" size:15];
        button.titleLabel.textColor = [UIColor whiteColor];
        button.titleLabel.textAlignment = UIBaselineAdjustmentAlignBaselines ;         
        button.showsTouchWhenHighlighted = YES;

        [ScrollView addSubview:button];

        btnX = btnX + 100;

    

    btnX = btnX - 80;

    ScrollView.contentSize = CGSizeMake(btnX + 50, 80);
    ScrollView.hidden = YES;


    [self.scrollViewArray addObject:ScrollView];
    [self addSubview:ScrollView];      

这正是我想要的。

然后我检测哪个按钮，哪个滚动视图被按下来触发动作。

-(void)subButtonTarget:(UIButton *)sender

    int button = sender.tag;
    int scrollview = self.selectedScrollView;

[self.videoEditor subAction:button ofScrollView:scrollview];



-(void)buttonAccess:(UIButton *)sender

    //  self.selectedScrollView = sender.tag;

    for (int i=0; i< self.scrollViewArray.count; i++) 

        UIScrollView *scrollview= [self.scrollViewArray objectAtIndex:i];
    scrollview.hidden= YES;
    

    int scrollIndex = sender.tag;
    UIScrollView *scrollview= [self.scrollViewArray objectAtIndex:scrollIndex];
    scrollview.hidden = NO;

基本上当其中一个按钮被触摸时，它会调用视图控制器中最初调用子类的函数。

问题是，在 touchevent 上，除了NSLog，什么都没有发生。会不会是因为子类和使用它的VC的依赖关系？

【问题讨论】：

问题是，在 touchevent 上什么都没有发生，除了 NSLog。 NSLog 它在哪里？

在原始viewController VideoEditor中的函数“subAction”。当我从 VideoEditor 调用 subAction 时，函数中的任何内容都有效。但是当我从VideoEditor触发的UIView子类中调用“SubAction”时，只有“SubbAction”中的NSLog有效。

也许，您应该先尝试在UIView 中添加按钮。然后看看它是否有效。这样你就可以知道问题出在哪里了：UIScrollView with button or your subclass

【参考方案1】：

你应该为每个 UIScrollView 设置这个

ScrollView.delaysContentTouches = NO;

并尝试使用覆盖方法继承UIScrollView

-(BOOL)touchesShouldCancelInContentView:(UIView *)view
   
    return YES;