Objective-c – How to cast id to a float

castingmacosobjective-c

I'm having trouble with this code:

NSRect itemFrame;
id item;
// code to assign item goes here.
itemFrame.origin.y -= [item respondsToSelector:@selector(selectedHeight)] ? [item selectedHeight]   : [self defaultSelectedHeight];

This is the problematic bit:

[item selectedHeight]

The compiler is assuming that the return type is id. I though that adding a cast would fix this:

(float)[item selectedHeight]

but it doesn't work.

What am I doing wrong? (I suspect the problem is to do with resolving pointers related to id but I can't find any relevant documentation).

Best Solution

you want [[item selectedHeight] floatValue], assuming that the selectedHeight returns an NSNumber.

Related Solutions

C# – How to cast int to enum

From an int:

YourEnum foo = (YourEnum)yourInt;

From a string:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")
}

Update:

From number you can also

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

Git – How to Remove .DS_Store files from a Git repository

Remove existing files from the repository:

find . -name .DS_Store -print0 | xargs -0 git rm -f --ignore-unmatch

Add this line:

.DS_Store

to the file .gitignore, which can be found at the top level of your repository (or create the file if it isn't there already). You can do this easily with this command in the top directory:

echo .DS_Store >> .gitignore

Then commit the file to the repo:

git add .gitignore
git commit -m '.DS_Store banished!'

Best Solution

Related Solutions

C# – How to cast int to enum

Git – How to Remove .DS_Store files from a Git repository

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