Question

我的头文件中的以下代码有什么问题我有一个属性：

@property (nonatomic,retain) NSMutableArray *imgArray;

当我在最后查看NSLog时，＆＃34; imgArray＆＃34;总是空的。我试图在UIImageView子类中拉出多个图像来制作动画＆＃34; gif＆＃34;。问题是数组总是空的，所以它不添加任何图像，因为数组是空的。

在我的.m文件中：

@implementation AnimatedOverlay

BOOL isValid;

@synthesize imgArray;

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

-(void) startAnimatingWithFrame:(CGRect)frame
{
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];

NSDate *today = [NSDate date];
NSDate *hourAgo = [[NSDate alloc] initWithTimeInterval:-3600 sinceDate:today];

[dateFormat setDateFormat:@"yyyyMMdd"];
NSString *dateString = [dateFormat stringFromDate:today];
[dateFormat setDateFormat:@"HH"];
NSString *hourString = [dateFormat stringFromDate:today];

[dateFormat setDateFormat:@"HH"];
NSString *hourString2 = [dateFormat stringFromDate:hourAgo];

imgArray = [[NSMutableArray alloc] init];

for(int i=0;i<=5;i++){
    NSURL *fileUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://radar.weather.gov/ridge/Conus/RadarImg/southeast_%@_%@%i8_N0Ronly.gif",dateString,hourString,i]];
    NSURLRequest* request = [NSURLRequest requestWithURL:fileUrl];
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse * response,NSData * data,NSError * error) {
         if ([data length] >0 && error == nil){
             UIImage *image = [UIImage imageWithData:data];
             if(image!=nil){
                 [imgArray addObject:image];

             }
         }else if ([data length] == 0 && error == nil){
             NSLog(@"Nothing was downloaded.");
         }else if (error != nil){
             NSLog(@"Error = %@", error);
         }
     }];
}
NSLog(@"%@",imgArray);

self.animationImages = [[NSArray alloc] initWithArray:imgArray];
self.animationDuration = 1.0f;
self.animationRepeatCount = 0;
[self startAnimating];
}

Answer 1

for(int i=0;i<=5;i++){
NSURL *fileUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://radar.weather.gov/ridge/Conus/RadarImg/southeast_%@_%@%i8_N0Ronly.gif",dateString,hourString,i]];
NSURLRequest* request = [NSURLRequest requestWithURL:fileUrl];
[NSURLConnection sendAsynchronousRequest:request
                                   queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse * response,NSData * data,NSError * error) {
     if ([data length] >0 && error == nil){
         UIImage *image = [UIImage imageWithData:data];
         if(image!=nil){
             [imgArray addObject:image];

         }
     }else if ([data length] == 0 && error == nil){
         NSLog(@"Nothing was downloaded.");
     }else if (error != nil){
         NSLog(@"Error = %@", error);
     }
//Use your imgArray inside the completion handler block, right now you are using it outside the block 

NSLog(@"%@",imgArray);

self.animationImages = [[NSArray alloc] initWithArray:imgArray];
self.animationDuration = 1.0f;
self.animationRepeatCount = 0;
[self startAnimating];
}];
}

希望这对你有用。

NSURLConnection响应未添加到Mutable数组中

1 个答案: