Question

我正在开发一个在Imageview上显示多个图像的视图，并且图像的计数是动态的。我通过URL获取这些图像，URL的字符串存储在一个数组中。

我已经采用for循环为每个要在其上显示的图像创建新的imageview。基于图像的大小设置图像视图的帧。但问题在于，当图像数量超过5时，第六张图像会从屏幕中消失。但如果阵列中有超过5个图像，我希望它向下移动。

下面是我使用for-loop

在imageview上显示图像的代码

int x=0;
for (int i=0;i<[items count]; i++)
{
    NSLog(@"image name %@",[items objectAtIndex:i]);
    NSLog(@"image url  %@",[NSURL URLWithString:[NSString stringWithFormat:@"%@",[items objectAtIndex:i]]]);

    NSString* urlTextEscaped = [[NSString stringWithFormat:@"%@",[items objectAtIndex:i]] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSData *imgData=[NSData dataWithContentsOfURL:[NSURL URLWithString:urlTextEscaped]];        

    UIImageView *imgV = [[UIImageView alloc]initWithImage:[UIImage imageWithData:imgData]];
    imgV.frame=CGRectMake(x, 0, 50, 50);
    [cell.contentView addSubview:imgV];
    x=x+imgV.frame.size.width+10;
}

Answer 1

转换为此图像

int x=0;
int y =0;
 for (int i=0;i<[items count]; i++)
{
  NSLog(@"image name %@",[items objectAtIndex:i]);
  NSLog(@"image url  %@",[NSURL URLWithString:[NSString stringWithFormat:@"%@",[items objectAtIndex:i]]]);

   NSString* urlTextEscaped = [[NSString stringWithFormat:@"%@",[items objectAtIndex:i]] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
   NSData *imgData=[NSData dataWithContentsOfURL:[NSURL URLWithString:urlTextEscaped]];        

   UIImageView *imgV = [[UIImageView alloc]initWithImage:[UIImage imageWithData:imgData]];
   imgV.frame=CGRectMake(x, y, 50, 50);
   [cell.contentView addSubview:imgV];
   if(x>cell.frame.size.width)
     {
         x =0;
         y= y+imgV.frame.size.height+10;
     }
     else
     {
      x=x+imgV.frame.size.width+10;

     }
 }

Answer 2

您可以在滚动视图或桌面视图中显示图像，以便在有许多图像时无法在屏幕中显示所有这些图像。然后它将具有滚动功能。

Answer 3

如果您使用的是故事板，请将 scrollview 添加到viewController的视图中，然后使用此示例代码可以帮助您。

#import "ViewController.h"

@interface ViewController ()
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;

@end

@implementation ViewController

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

    [self addView:15];
}


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

-(void) addView:(NSInteger)numberOfViews
{
    double x =10 , y=10;

    for (NSInteger i=1; i <= numberOfViews; i++) {
        UIView * view = [[UIView alloc] initWithFrame:CGRectMake(x, y, 50, 50)];
        y = y+70;
        [view setBackgroundColor:[UIColor purpleColor]];
        [_scrollView addSubview:view];
    }
}
@end

注意：在界面构建器中，单击您的滚动视图，然后单击属性检查器并选中（勾选）滚动视图部分
下的垂直弹跳选项

如果子视图超出ios中的屏幕边界，如何向下移动子视图

3 个答案: