Question

我刚刚开始研究一个项目，我已经遇到了一些问题和错误。我想知道你们是否可以帮助我找出错误的位置。

快速概述：我有两个文件：（ViewController.m和Scroller.m）。在ViewController中，我在ViewDidLoad下有一些代码（我将在一秒钟内显示），我还有一个功能（addImagesToView），它可以完成它所说的内容，还有一些touchesBegan，移动和结束是为了难以处理。

在Scroller中，我决定重写一些“ - （void）touches”函数实现。

我遇到的问题：是按钮（来自addImagesToView功能）突出显示。我用NSLog进行了一些测试，看看哪个“触摸”工作，哪个不工作。 “touchesMoved”无法正常工作。如果用户向下拖动，则在大约3或4行文本后日志停止。我认为它会以某种方式干扰滚动。

这是ViewController.m的内容：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"bgPNG.png"]];

    imageView.frame = CGRectMake(0, 0, 320, 480);
    [self.view addSubview:imageView];

    //UIColor *background = [[UIColor alloc]initWithPatternImage:imageView.image];
    //self.view.backgroundColor = background;

    CGRect fullScreen = [[UIScreen mainScreen] applicationFrame];

    scroll = [[Scroller alloc] initWithFrame:fullScreen];
    scroll.contentSize = CGSizeMake(320, 2730);

    scroll.delaysContentTouches = NO;
    //scroll.canCancelContentTouches = NO;
    scroll.scrollEnabled  = YES;

    [self.view addSubview:scroll];

    buttons = [[NSMutableArray alloc]init];

    [self addImagesToView];



}

-(void) addImagesToView{




    CGFloat yCoordinate = 35;

    for (int i=1; i<=18; i++) {

        UIImageView *image = [[UIImageView alloc]initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@"picture%d.png",i]]highlightedImage:[UIImage imageNamed:[NSString stringWithFormat:@"picture%dHG.png",i]]];

        CGRect position = CGRectMake(105, yCoordinate, IMAGE_SIZE, IMAGE_SIZE);
        image.frame = position;

        [scroll addSubview:image];

        image.userInteractionEnabled = YES;
        image.tag = i;

        [buttons addObject:image];
        yCoordinate += 150;


    }
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Get any touch
    UITouch *t = [touches anyObject];


    if ([t.view class] == [UIImageView class])
    {

        // Get the tappedImageView
        UIImageView *tappedImageView = (UIImageView*) t.view;
        tappedImageView.highlighted = YES;
    }
}

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *t = [touches anyObject];
    if ([t.view class] == [UIImageView class])
    {

        // Get the tappedImageView
        UIImageView *tappedImageView = (UIImageView*) t.view;
        tappedImageView.highlighted = NO;
    }

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources th at can be recreated.
}

@end

这是Scroller.m

#import "Scroller.h"

@implementation Scroller

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (!self.dragging)
        [self.nextResponder touchesBegan: touches withEvent:event];
    else
        [super touchesBegan: touches withEvent: event];
}

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *t = [touches anyObject];
    if ([t.view class] == [UIImageView class])
    {

        // Get the tappedImageView
        UIImageView *tappedImageView = (UIImageView*) t.view;
        tappedImageView.highlighted = NO;
    }

}


-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (!self.dragging)
        [self.nextResponder touchesEnded: touches withEvent:event];
    else
        [super touchesEnded: touches withEvent: event];        // Get the tappedImageView

}

/*
 // Only override drawRect: if you perform custom drawing.
 // An empty implementation adversely affects performance during animation.
 - (void)drawRect:(CGRect)rect
 {
 // Drawing code
 }
 */

@end

我还试图在ViewController中实现所有的触摸，但我不知道如何从滚动中读取它（请注意SCROLL和SCROLLER之间的差异）。

正如你所知，我试图像这样订购它们：view - ＆gt; backGroundImage - ＆gt; scroller - ＆gt; addImagesToView（函数），以便从[I] addImagesToView [/ I]出来的图像位于滚动的顶部。这是我想要的等级制度。

非常感谢。

Answer 1

您无需为按钮按下编写自己的触摸处理程序。不要使用UIImageView，而只需创建UIButton s并挂钩他们的UIControlEventTouchUpInside事件。

Answer 2

我认为你最好告诉我们你要完成什么，因为你可能在这里咆哮错误的树。正如吉姆所说，有更好的方法来选择图像，即使你想自己处理触摸，UIGestureRecognizer可能是更好的选择。如果您允许用户选择图像，我建议您在github上查看iCarousel。它是一个开源的旋转木马，非常适合图像选择。此外，如果您可以定位iOS 6，则可以使用新的集合视图。

按钮卡在突出显示上

2 个答案: