To perform matrix addition in Swift, we first need to define two matrices of the same size (i.e. same number of rows and columns). We can represent each matrix using an array of arrays, where each inner array represents a row of the matrix.

Here's an example of how to perform matrix addition in Swift using loops:

```main.swift```// Define two matrices A and B
let A = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
let B = [[9, 8, 7], [6, 5, 4], [3, 2, 1]]

// Get the number of rows and columns of the matrices
let rows = A.count
let columns = A[0].count

// Initialize an empty matrix C to store the result
var C = [[Int]](repeating: [Int](repeating: 0, count: columns), count: rows)

// Loop over the rows and columns of the matrices, adding the corresponding elements
for i in 0..<rows {
for j in 0..<columns {
C[i][j] = A[i][j] + B[i][j]
}
}

// Print the result
print(C)
```551 chars21 lines```

In this example, we first define two matrices `A` and `B`. We then get the number of rows and columns of the matrices, which are both 3 in this case. We initialize an empty matrix `C` of the same size as `A` and `B` to store the result.

We then use nested loops to iterate over each element of `A` and `B`, and add the corresponding elements to get the result matrix `C`. Finally, we print the result matrix `C` using `print(C)`.

This code should output the following result:

```main.swift```[[10, 10, 10], [10, 10, 10], [10, 10, 10]]
```43 chars2 lines```

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