将特定图像设置为UIImageView

Question

I have 10 images named 0.png to 9.png and also a randomiser give me a random number between these 10.

And well depending on the number the randomiser gives me, I want to set my UIImageView with that image.

My idea was to do it like this:

[image setImage:[UIImage imageNamed: @"%d.jpg", currentQuestion]];

As this works fine when I'm setting the text of a NSLog with the random number like this:

NSLog(@"Some Text %d", currentQuestion);

However when I try to set the image I get this error:

Too many arguments to method call, excepted 1, have 2

Answer 1

First, as @Azat said, you should use one specific NSString as the parameter of imageNamed: method.

In addition, a better way to achieve this may use a NSArray to store the names of these candidate images like:

NSArray *imageNames = @[@"1.png", @"2.png", @"3.png"];

Then, you could use the random number as the index of the image name array instead of constructing the image name by yourself.

[image setImage:[UIImage imageNamed:imageNames[currentQuestion]]]

A benefit to do this way is you don't need to modify your code even if the name of imaged were changed, just change the name in the image names array.

Answer 2

You should use the following code instead:

[image setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg", currentQuestion]]];

The thing that +imageNamed: takes only one argument and you should construct it as formatted string, whereas NSLog can take variable number of arguments

Also you say that you have 0.png to 9.png but construct image names using jpg . Please check the extension too