UIImage（从路径）到 NSData 导致崩溃

Question

我有以下代码

for (int i=0; i<self.imageArray.count; i++) 
{
    [self.operation addData:[self getDataFromImage:[self.imageArray objectAtIndex:i]] 
    forKey:[NSString stringWithFormat:@"pa_image%d",i+1] 
    mimeType:@"image/png" 
    fileName:[NSString stringWithFormat:@"pa_image%d.png",i+1]];

}

从这里调用以下方法

-(NSData *)getDataFromImage:(UIImage *)image
{
    NSData *imageData=  UIImageJPEGRepresentation(image, 0.1);
    return imageData;
}

当

时，我的 imageArray 代码中有 2 个场景

1) 值来自 imageArray 中的 API，例如 "images/upload/d872f1.png"、"images/upload/0fdade.png"，然后在 NSData 中返回 nil。我想从此路径转换为 NSData。怎么办？

执行此行后，我的应用程序崩溃了。它正在给

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString CGImage]: unrecognized selector sent to instance 0x7f83a1f13510'

2) 当我从 phone 上传时，它类似于 " , {834, 1250} "。我的代码在这种情况下正常工作，它转换为 NSData。

有关详细信息，请参阅我的 addData 方法

-(void) addData:(NSData*) data forKey:(NSString*) key mimeType:(NSString*) mimeType fileName:(NSString*) fileName 
 {

  if ([self.request.HTTPMethod isEqualToString:@"GET"]) 
  {
  [self.request setHTTPMethod:@"POST"];
 }

 NSDictionary *dict = @{@"data": data,
@"name": key,
@"mimetype": mimeType,
@"filename": fileName};

[self.dataToBePosted addObject:dict];
}

Answer 1

Try This

for (int i=0; i<self.imageArray.count; i++) 
{
    UIImage *image;
    if([[self.imageArray objectAtIndex:i] isKindOfClass:[NSString class]]){
     image = [UIImage imageNamed:[self.imageArray objectAtIndex:i]];
    }else{
     image = [self.imageArray objectAtIndex:i];
     }
    [self.operation addData:[self getDataFromImage:image] 
forKey:[NSString stringWithFormat:@"pa_image%d",i+1] 
mimeType:@"image/png" 
fileName:[NSString stringWithFormat:@"pa_image%d.png",i+1]];

}

Answer 2

是的，用断点检查你的数组。它包含字符串而不是图像。

异常本身就是解释性的。

Answer 3

        if([[self.imageArray objectAtIndex:i] isKindOfClass:[NSString class]])
        {

            NSString *stringFromAPI = [self.imageArray objectAtIndex:i];

            NSURL *url=[NSURL URLWithString:stringFromAPI];

            image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];

        }else
        {
            image = [self.imageArray objectAtIndex:i];
        }
        [self.operation addData:[self getDataFromImage:image]
                         forKey:[NSString stringWithFormat:@"pa_image%d",i+1]
                       mimeType:@"image/png"
                       fileName:[NSString stringWithFormat:@"pa_image%d.png",i+1]];

UIImage（从路径）到 NSData 导致崩溃

UIImage (from path) to NSData causes crash

ios

objective-c

crash

uiimage

nsdata