从Parse.com将徽标图像加载到UIImage中

Question

i am trying to load a Logo image in to a UiImage the logo image is in parse but not sure how to load it in to the viewcontroller

.h file

@property (weak, nonatomic) IBOutlet UIImageView *Logo;

.m File

self.Logo.image = [self.exam objectForKey:@"Logo"];

it throws the following error

-[PFFile size]: unrecognized selector sent to instance

so i have to use PFfile but not sure how to format it i have searched but most examples have a query invoiled and i dont need the query as the data is there ready in

self.exam objectForKey:@"Logo"

now added

[self.exam objectForKey:@"Logo"];
self.Logo.image = [[UIImage alloc] initWithData: [self.exam objectForKey:@"Logo"]];

but get the following error the image is a .png

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PFFile length]: unrecognized selector sent to instance

NSlog is showing the file as

Logo = "<PFFile: 0x111875190>";

Answer 1

[self.exam objectForKey:@"Logo"];

Is instance of class PFFile but not UIImage . You should convert it. You can try following:

self.Logo.image = [[UIImage alloc] initWithData: [[self.exam objectForKey:@"Logo"] getData]];

Answer 2

PFFile is a subclass of NSObject , thus the UIImage ' length method cannot be called, resulting to your NSInvalidArgumentException.

You should use an PFImageView instead of your UIImageView.

.h file

@property (weak, nonatomic) IBOutlet PFImageView *Logo;

.m file

self.Logo.file = [self.exam objectForKey:@"Logo"];
[self.Logo.loadInBackground];

A loadInBackground: method with completion block is also available.