About Swift Errors
Learning Path
Swift basics and playground • Optionals and error handling • Object-oriented and protocol-oriented programming • SwiftUI/UIKit • Core Data • Networking • App Store deployment
A powerful and intuitive programming language for macOS, iOS, watchOS, and tvOS.
Swift basics and playground • Optionals and error handling • Object-oriented and protocol-oriented programming • SwiftUI/UIKit • Core Data • Networking • App Store deployment
Problem | Difficulty | Views | Action |
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Featured
How to fix 'Cannot assign to value: 'X' is a 'let' constant' error in Swift?
Modifying immutable constants... |
Beginner |
247
views
|
View |
Featured
What causes "Unexpected non-void return value in void function" in Swift?
Void function return value... |
Beginner |
206
views
|
View |
Featured
How to solve "Initializer for conditional binding must have Optional type" in Swift?
Conditional binding requirement... |
Beginner |
300
views
|
View |
Featured
What's 'Use of unresolved identifier' error in Swift?
Undefined symbols in current scope... |
Beginner |
225
views
|
View |
Featured
How can I fix "Cannot assign value of type 'X' to type 'Y'" in Swift?
Type mismatch errors... |
Beginner |
209
views
|
View |
|
Beginner |
196
views
|
View |
Featured
Why is "Ambiguous use of 'functionName'" appearing in Swift?
Ambiguous function reference... |
Beginner |
203
views
|
View |
|
Intermediate |
208
views
|
View |
|
Intermediate |
194
views
|
View |
|
Intermediate |
226
views
|
View |
How to resolve "'nil' used before being initialized" in Swift?
Uninitialized optional usage... |
Beginner |
159
views
|
View |
Swift classes and initializers?
Class initialization rules and patterns... |
Intermediate |
128
views
|
View |
Swift: Using Optionals?
Handling absence of values safely with Optionals... |
Beginner |
176
views
|
View |
Swift: Working with Dictionaries?
Storing key-value pairs... |
Beginner |
179
views
|
View |
How to handle errors using 'try-catch' in Swift?
Robust error handling patterns... |
Beginner |
166
views
|
View |
Using closures in Swift?
Closure syntax and capture semantics... |
Intermediate |
123
views
|
View |
Why do I encounter 'Unexpectedly found nil while unwrapping an Optional value' in Swift?
Safely handling forced unwrapping crashes... |
Beginner |
183
views
|
View |
Using Dictionaries in Swift?
Advanced dictionary techniques... |
Intermediate |
115
views
|
View |
What is "'X' is a 'Y' and cannot be used as an expression" in Swift?
Invalid expression usage... |
Beginner |
110
views
|
View |
Working with Structs in Swift?
When to use structs vs classes in Swift... |
Intermediate |
120
views
|
View |