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Added a few extra notes to Swift Notes #1

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Added a few extra notes to Swift Notes #1

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14 changes: 8 additions & 6 deletions Swift Notes
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Expand Up @@ -71,7 +71,7 @@ To get another pane in the playground window to display console output go to Vie

************************ iOS Basics ************************

An iOS app is split into a model, views,
An iOS app is split into a model, views,


A model for an iOS app is a class or set of classes that represent that class's data and operations the
Expand Down Expand Up @@ -142,7 +142,8 @@ Output:
Use a plus "+" symbol to join things in the print function.
print("This is a variable: " + myVar)


You can also concatenate strings in Swift using:
print("This is a variable: \(myVar)")


************************ VARIABLES ************************
Expand Down Expand Up @@ -171,7 +172,7 @@ Type Casting:
Float(345) // = 345.0
Double(23) // = 23.0
Int(34.4) // = 34, doesn't work on strings, instead use .toInt()

The .toInt() method for Strings, which returns an Optional since it might not be able to convert the string to a number. This means to safely unwrap what toInt() returns you need to use an if-let statement, as described in the section below on Optionals.


Expand Down Expand Up @@ -213,6 +214,7 @@ Accessing array elements:
Just use simple square bracket notation as normal:
myArr[1]
myArr[1] = "changed element"
myArr.objectAtIndex(index) // Accessing array elements in a more descriptive manner


Some Properties and Methods of arrays:
Expand Down Expand Up @@ -257,7 +259,7 @@ Some Properties and Methods of dictionaries:
Note that you don't need to put parenthesss around the conditions in loops, you can if you want though, it won't cause an error.

for loop:
for var i=0; i<10; i++ { }
for var i=0; i<10; i++ { }

for-in loop:
for item in collection { } // note that item is a constant in the loop
Expand Down Expand Up @@ -318,7 +320,7 @@ To get some information on a function in Xcode just hold the "option" key on the

To create a function use the func keyword:

func funcName(parameter: dataType, parameter: dataType) -> returnType {
func funcName(parameter: dataType, parameter: dataType) -> returnType {
// code
}

Expand Down Expand Up @@ -437,4 +439,4 @@ Optional Chaining

************************ x ************************

************************ x ************************
************************ x ************************