Question

我有一种方法可以在UIWebview中加载一些youtube视频，我有很多视频，当我运行代码时，我收到收到内存警告，应用程序崩溃了。我尝试使用did received memory waring修复它，但它无法正常使用这是我正在使用的方法： -

-(void) setScrollView:(UIScrollView *)scrollview :(NSArray *)contentArray{

int x=0;

for(NSDictionary *str in contentArray){

    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(x, 0, 123, 123)];

    webView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;

    webView.scrollView.scrollEnabled = NO;

    webView.scrollView.bounces = NO;

    NSString *link = [str objectForKey:@"UTUBEURL"];

    link = [@"http://www.youtube.com/v/" stringByAppendingFormat:link];

    NSLog(@"link = %@",link);


    NSString *embedHTML = @"\
    <html><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0  \">\
    <style type=\"text/css\">\
    body {\
    background-color: transparent;\
    color: white;\
    }\
    </style>\
    </head><body width=\"%0.0f\" height=\"%0.0f\" style=\"margin:0\">\
    <embed id=\"yt\" src=\"%@\" type=\"application/x-shockwave-flash\" \
    width=\"%0.0f\" height=\"%0.0f\" autostart=\"true\"></embed>\
    </body></html>";

    NSString* html = [NSString stringWithFormat:embedHTML,webView.frame.size.width, webView.frame.size.height,link, webView.frame.size.width, webView.frame.size.height];


    [webView loadHTMLString:html baseURL:nil];


    UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(x,123,200,20)];

    [title setFont:[UIFont systemFontOfSize:11]];
    [title setBackgroundColor:[UIColor blackColor]];
    [title setTextColor:[UIColor whiteColor]];
    title.text = [NSString stringWithFormat:@" %@",[str objectForKey:@"DISPLAYTEXT"]];

    x += webView.frame.size.width+2;


    [scrollview addSubview:webView];
    [scrollview addSubview:title];

}

scrollview.contentSize = CGSizeMake(x, scrollview.frame.size.height);
}

我在这里有大约50个视频，所以我可以做些什么来避免这种情况我在 viewDidLoad 旁边调用这个方法。有没有办法更好地使用一个线程，有人可以帮助我吗？但我对ios上的线程没有任何了解。

Answer 1

我无法为您编写完整的代码，但为您提供了一小段代码来帮助您。

你制作了一个scrollView，包含了要播放的视频的缩略图，并分别将这些网址保存在一个数组中

**In VideoPlayContoller.h**

#import <MediaPlayer/MediaPlayer.h>
@interface VideoPlayViewController : UIViewController{

    MPMoviePlayerController *moviePlayerController;

}

@property (nonatomic, readwrite) int i;
@property (nonatomic, retain) NSMutableArray *allVideoUrls;

-(void)playVideo:(int)_index;

- (IBAction)onTapBack:(id)sender;

@end

**In VideoPlayContoller.m**

#import "VideoPlayViewController.h"
#import <MediaPlayer/MediaPlayer.h>

@implementation VideoPlayViewController

@synthesize i,allVideoUrls;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        allVideoUrls = [[NSMutableArray alloc]init];
    }
    return self;
}

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

    [self playVideo:i];
}

-(void)playVideo:(int)_index{

    NSURL *fileURL = [NSURL URLWithString:[allVideoUrls objectAtIndex:i]];

    if(!moviePlayerController){
        moviePlayerController = [[MPMoviePlayerController alloc] init];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlaybackComplete:) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayerController];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doneButtonClick:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];
    }
    moviePlayerController.fullscreen = YES;
    [moviePlayerController setContentURL:fileURL];
    if([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0){
        [moviePlayerController.view setFrame:CGRectMake(0, 62, 320, 504)];
    }
    else{
        [moviePlayerController.view setFrame:CGRectMake(0, 62, 320, 416)]; //y = 42
    }
    [self.view addSubview:moviePlayerController.view];

    [moviePlayerController play];   
}

- (IBAction)onTapBack:(id)sender {
    [moviePlayerController stop];
    [self dismissModalViewControllerAnimated:NO];
}

- (void)moviePlaybackComplete:(NSNotification *)notification{
    i++;

      [moviePlayerController stop];
      [moviePlayerController.view removeFromSuperview];
      [self dismissModalViewControllerAnimated:NO];
      [self dismissModalViewControllerAnimated:NO];
}

-(void)doneButtonClick:(NSNotification*)aNotification{
    NSLog(@"Done button Clicked");
    [self dismissModalViewControllerAnimated:NO];
}

Answer 2

看起来你想要使用UICollectionView - 发生什么事情是你正在将大量的这些webview加载到内存中而且它太多了。您需要利用细胞重用。

阅读一些教程并让自己加快速度 -

加载uibweview时收到内存警告

2 个答案: