CODEWITHSUNDEEP
iosobjective-carraysimage
agr0
agr0

Reputation: 33

objective-c - How to show an UImage in an array?

I'm trying to show in my app also images instead of text and so I'm trying to integrate UIImages in my text array. Badly I get every time I try to implement an error so I decided to ask objective-c pros. Every help is needed and welcome!

This is my .h array code:

// array
@property (nonatomic, strong) NSArray *aFacts;

// pich a random fact
@property (NS_NONATOMIC_IOSONLY, readonly, copy) NSString *randomAFact;

and my .m array code

-(instancetype) init {
    self = [super init];
    if (self) {
        _aFacts = @[@"Humans are the only primates that don’t have pigment in the palms of their hands.",
                         [UIImage imageNamed:@"refresh"],
];

    }
    return self;
    }

// arcm4
-(NSString *)randomAFact {
    int random = arc4random_uniform((int)self.aFacts.count);
    return (self.aFacts)[random];
}

@end

This code is shown in a label. Do you think the label will show an successful integrated image in the array?

Upvotes: 0

Views: 110

Answers (1)

Luca Angeletti
Luca Angeletti

Reputation: 59496

Preamble

To add text to a label you write this (as you are doing now).

self.label.text = @"This is a test";

To add an image you write this.

NSTextAttachment * attachment = [[NSTextAttachment alloc] init];
attachment.image = [UIImage imageNamed:@"refresh"];
self.label.attributedText = [NSAttributedString attributedStringWithAttachment:attachment];

So we should do the following changes to your code.

1. Populating the array.

You should not add the image directly inside the array. Add an NSAttributedString instead. So your init becomes:

- (instancetype) init {
    self = [super init];
    if (self) {
        NSTextAttachment * attachment = [[NSTextAttachment alloc] init];
        attachment.image = [UIImage imageNamed:@"refresh"];
        NSAttributedString * attributedString = [NSAttributedString attributedStringWithAttachment:attachment];
        _aFacts = @[@"Humans are the only primates that don’t have pigment in the palms of their hands.", attributedString];
    }
    return self;
}

2. Updating randomAFact

Delete your randomFact method and add this new version.

- (void)populateLabel:(UILabel*)label {
    int random = arc4random_uniform(@(_aFacts.count).intValue);
    NSObject * element = _aFacts[random];
    if ([element isKindOfClass:NSString.class]) {
        NSLog(@"Will add string")          
        label.attributedText = nil;         
        label.text = (NSString*) element;
    } else if ([element isKindOfClass:NSAttributedString.class]) {
        NSLog(@"Will add image")
        label.text = nil;           
        label.attributedText = (NSAttributedString*)element;
    } else {
        NSLog(@"_aFacts array is supposed to contain only NSString(s) and NSAttributedString(s). Instead a %@ has been found at index %d", NSStringFromClass(element.class), random);
    }
}

As you can see this method receives as parameter a UILabel and populates it with a random value from _aFacts.

3. Calling populateLabel

Now you will need to update the code that populates your label.

So where you have something like this:

self.label.text = [self.aFactBook randomAFact];

you will need to use this:

[self.aFactBook populateLabel:self.label];

Hope it helps.

Upvotes: 1

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