如何在ios中从UIImage设置图像

Question

我正在从联系人中获取图像并将其存储为：

NSData *contactImageData = (__bridge NSData *)ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);
UIImage  *img = [UIImage imageWithData:contactImageData];
NSLog(@"%@",img); //returns like '<UIImage: 0x7fc740460260>'

[contactInfoDict setObject:img forKey:@"image"]; //contactInfoDict is a NSDictionary

现在我再次将图像设置为：

UIImage *image = [UIImage imageWithCGImage:(__bridge CGImageRef)([contactInfoDict objectForKey:@"image"])];
cell.profileImg.image = image;

但是什么也没发生。根本没有图像。我做错了什么？

更新

我也试过了：

NSData *contactImageData = (__bridge NSData *)ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);
[contactInfoDict setObject:contactImageData forKey:@"image"];

像这样获取它：

 NSString *str = [contactInfoDict objectForKey:@"image"];
 NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];
 UIImage *image = [UIImage imageWithData:data];
 cell.profileImg.image = image;

但不工作。将 NSData 设置为图像后图像返回 nil。

Answer 1

首先check person 有image。现在使用ABPersonCopyImageDataWithFormat

if (ABPersonHasImageData(yourPersonObject)) 
{
   //person has image
   //ARC need to take ownership of the Core Foundation object . Use CFBridgingRelease
   //Your mistake is here where i have changed
   NSData *imgData = CFBridgingRelease(ABPersonCopyImageDataWithFormat(yourPersonObject, kABPersonImageFormatThumbnail));

   if(imgData)
   {
      UIImage  *img = [UIImage imageWithData:imgData];
      if(img)
      {
         [contactInfoDict setObject:img forKey:@"image"];
      }
   }
}
else
{
   NSLog(@"no image");
}

Answer 2

您可以使用此方法获取图像：

 - (void)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker
                             didSelectPerson:(ABRecordRef)person
    {
    if (ABPersonHasImageData(person)) {
        NSData *contactImageData = (__bridge NSData *)ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);

      UIImage *image=[UIImage imageWithData:contactImageData];
    }

    [_addressBookController dismissViewControllerAnimated:YES completion:nil];

}

Answer 3

您正在为键设置 UIImage。所以我认为你不需要这段代码：

UIImage *image = [UIImage imageWithCGImage:(__bridge CGImageRef)([contactInfoDict objectForKey:@"image"])];
cell.profileImg.image = image;

只是

UIImage *image = (UIImage*)[contactInfoDict objectForKey:@"image"];
cell.profileImg.image = image;

Answer 4

试试这个。

NSData *imagedata = (__bridge NSData *)(ABPersonCopyImageData(person));
UIImage  *img;
if(imagedata !=nil)
img = [UIImage imageWithData:contactImageData];
else  // assign it a temporary image.
img = [UIImage imageNamed:@"TempImage"];

[contactInfoDict setObject:img forKey:@"image"];

之后：

UIImage *image = [UIImage imageWithCGImage:(__bridge CGImageRef)([contactInfoDict objectForKey:@"image"])];
    cell.profileImg.image = image;

Answer 5

好的，所以你在这里从CGImage 创建一个UIImage 并将其存储在NSDictionary 中：

NSData *contactImageData = (__bridge NSData *)ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);
UIImage  *img = [UIImage imageWithData:contactImageData];
NSLog(@"%@",img); //returns like '<UIImage: 0x7fc740460260>'
[contactInfoDict setObject:img forKey:@"image"];

但在这里你将UIImage 对象视为CGImage（请记住，你已经创建了UIImage

UIImage *image = [UIImage imageWithCGImage:(__bridge CGImageRef)([contactInfoDict objectForKey:@"image"])];
cell.profileImg.image = image;

试试这个：

cell.profileImg.image = [contactInfoDict objectForKey:@"image"];

Answer 6

首先将contactInfoDict 当作NSMutableDictionary 然后试试下面的代码。

NSData *contactImageData = (__bridge NSData *)ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);
[contactInfoDict setObject:[UIImage imageWithData:contactImageData]; forKey:@"image"]; 

// As its an Mutable dictionary, it will save the Value for sure.

再次获取图像

cell.profileImg.image = ( UIImage *) [contactInfoDict objectForKey:@"image"];

更新

直接通过记录id从通讯录中获取图片

ABAddressBookRef addressBook = ABAddressBookCreate( ); 
NSNumber *recordId = [NSNumber numberWithInteger:[record_str integerValue]];
ABRecordRef person = ABAddressBookGetPersonWithRecordID(addressBook,recordId.integerValue);
NSData *contactImageData = (__bridge NSData *)ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);
cell.profileImg.image = [UIImage imageWithData:contactImageData];