我有一个iPhone应用程序,我需要加载大量的图像(即大约50个),它有一个小的矩形(略高于缩略图),每行包含3个,每页有4列,我需要水平滚动以加载下12个图像,依此类推。此外,我需要将其下的页码显示为1,2等。
任何人都可以指导我在正确的方向上实现滚动视图吗?我真的很乱,如何将imageview添加到这样的滚动视图中,每个图像视图也都有自己的按钮。
答案 0 :(得分:0)
我解决这个问题的方法如下:(我不会提供很多细节,因为它们取决于您的特殊需求和要求)。
.h文件:
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController <UIScrollViewDelegate>
@property (unsafe_unretained, nonatomic) IBOutlet UIScrollView *scrollView;//assuming the scrollView is connected in a xib file
-(id)initWithImages:(NSArray*)images;//that could be whatever format you get your images(UIImage, urls to download, file names or custom views. Here we assume that the array contains instances of UIImage)
@end
.m文件:
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) NSArray *images;
@property (nonatomic, assign) CGFloat pageWidth;
@property (nonatomic, assign) int currentPage;
@end
@implementation ViewController
-(id)initWithImages:(NSArray*)images{
self = [super init];
if(self){
self.images = images;
}
return self;
}
-(void)viewDidLoad{
[super viewDidLoad];
[self.scrollView setDelegate:self];
[self.scrollView setContentSize:CGSizeMake(self.scrollView.frame.size.width*self.imageURLsArray.count,
self.scrollView.frame.size.height)];
[self.scrollView setPagingEnabled:YES];
[self.scrollView setShowsVerticalScrollIndicator:NO];
self.pageWidth = self.scrollView.frame.size.width;
for(int i = 0; i < self.images.count; i++){
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(self.scrollView.frame.size.width*i,
self.scrollView.frame.origin.y,
self.scrollView.frame.size.width,
self.scrollView.frame.size.height)];
imageView.image = [self.images objectAtIndex:i];
[self.scrollView addSubview:imageView];
}
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
int page = floor(scrollView.contentOffset.x - self.pageWidth/2)/self.pageWidth + 1;
if(self.currentPage != page){
NSLog(@"Scrolled to new page: %d", page);
self.currentPage = page;
//do additional things based on the fact that you have scrolled to a new page (like changing the page number)
}
}
@end
答案 1 :(得分:0)
使用UItableview创建包含两个图像视图的自定义单元格,并将该自定义单元格加载到索引路径的单元格,然后创建一个nsarray并将图像名称传递到该数组,然后将该图像转换为数据格式,例如
nsdata * data = [url的NSdata dataWithcontents [索引处的数组对象:indexpath.row]]; cell.imageview.image = [uiimage imagewithdata:data]; 为此你应该知道创建自定义单元格。