我有UIScrollView,它包含來自服務器的圖像。在UIScrollView中加載圖像時的活動指示器
我應該在圖像當前加載時放置活動指示器。
UIScrollView包含來自服務器的動態圖像數量。
我可以知道如何在圖像加載時在每個頁面上添加活動指示器,並且在加載圖像後移除它。
這裏是我的代碼來檢索圖片:
NSDictionary *items = [NSDictionary dictionaryWithObject:dictInfo forKey:@"images"];
imageList = [items objectForKey:@"images"];
NSArray *img = [imageList objectForKey:@"list"];
NSInteger imgCount = [img count];
buttonArray = [[NSMutableArray alloc] init];
for (int i=0; i<imgCount; i++) {
NSDictionary *imgDict = [img objectAtIndex:i];
// REQUEST FOR IMAGES
NSString *imgPath = [imgDict objectForKey:@"image_slot"];
NSString *imgURL = imgPath;
__block ASIHTTPRequest *requestImage = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:imgURL]];
[requestImage setCompletionBlock:^{
imgView = [UIImage imageWithData:[requestImage responseData]];
if (imgURL.length) {
[pendingRequests removeObjectForKey:imgURL];
}
scrollView.userInteractionEnabled = YES;
scrollView.exclusiveTouch = YES;
scrollView.canCancelContentTouches = YES;
scrollView.delaysContentTouches = YES;
scrollView.bounces = NO;
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
SWTUIButton *imgBtn = [[SWTUIButton alloc] initWithFrame:frame];
imgBtn.url = [requestImage.userInfo objectForKey:@"rURL"];
[imgBtn setImage:imgView forState:UIControlStateNormal];
imgBtn.backgroundColor = [UIColor clearColor];
[imgBtn addTarget:self action:@selector(buttonpushed:) forControlEvents:UIControlEventTouchUpInside];
[scrollView addSubview:imgBtn];
[buttonArray addObject:imgBtn];
[imgBtn release];
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * img.count, self.scrollView.frame.size.height);
}];
感謝您的回覆.. 我只是新iOS開發..我使用的是該工程..不好受 我做了什麼,而不是爲我創建了一個屬性(UIActivityIndicatorView)爲按鈕。活動指示器將可見,然後在圖像加載後停止動畫。 – lee 2012-05-11 06:44:34