I'm doing the following filtering that returns a recipe list, filtered by given category name value.
filteredRecipe = filteredRecipe.filter({
if let category = $0.valueForKey("category") as? NSManagedObject {
if let name = category.valueForKey("name") as? String {
return name.rangeOfString(cap) != nil
} else {
return false
}
} else {
return false
}
})
This filter works in association with searchBar textfield so I will possibly have random value in the textfield which will make filteredRecipe to hold unreliable data.
I need to make sure when the filter can't find any recipe from filteredRecipe with given category name value, I leave filteredRecipe untouched. Currently, when there is no match, it makes filteredRecipe empty array []. I'm not sure what part causes this.
You need to assign the filtering result to a temporary variable and check that it isn't empty.
let filtered = filteredRecipe.filter({
if let category = $0.valueForKey("category") as? NSManagedObject {
if let name = category.valueForKey("name") as? String {
return name.rangeOfString(cap) != nil
}
return false
})
if !filtered.isEmpty {
filteredRecipe = filtered
}
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