ios how to change another view controller's content in different view controller in swift
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I am new to swift and ios developer. And I want to create a side menu that the cell event will dynamically change the content in a container view. But it seems not work.
the left is the tableview(my side menu) and the right is the container view with a viewcontroller(vc2) on it
I try two ways to change background color of the container view
the first is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.view.backgroundColor = UIColor.white
}
and the second way is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.changecolor()
}
and in vc2
func changecolor()
{
print(123)
self.view.backgroundColor = UIColor.purple
}
it will print 123 but not change bg color
How can I change the content in other view controller ? (If I don't want to remove the current container view and change to another one)
ios swift
asked Nov 15 at 19:22
Jeffese
92
add a comment |
up vote
0
down vote
favorite
I am new to swift and ios developer. And I want to create a side menu that the cell event will dynamically change the content in a container view. But it seems not work.
the left is the tableview(my side menu) and the right is the container view with a viewcontroller(vc2) on it
I try two ways to change background color of the container view
the first is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.view.backgroundColor = UIColor.white
}
and the second way is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.changecolor()
}
and in vc2
func changecolor()
{
print(123)
self.view.backgroundColor = UIColor.purple
}
it will print 123 but not change bg color
How can I change the content in other view controller ? (If I don't want to remove the current container view and change to another one)
ios swift
asked Nov 15 at 19:22
Jeffese
92
It is the same situation with a segue: when you perform segue, UI elements (as IBOutlets) of destination are not yet set, so you cannot change them. That's why you need to set a property in destination and use this property after loading, or at viewWillAppear or viewDidAppear time.
– claude31
Nov 15 at 20:11
@claude31 But my vc2 is above the table view.I just push the x position of what above the table view to right.Didn’t the vc2 load already?(I can also click the bar item on it)
– Jeffese
Nov 16 at 2:26
Don't understand : in didSelectRow, you instantiate the VC2. Why, if it is already there ?
– claude31
Nov 17 at 8:05
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am new to swift and ios developer. And I want to create a side menu that the cell event will dynamically change the content in a container view. But it seems not work.
the left is the tableview(my side menu) and the right is the container view with a viewcontroller(vc2) on it
I try two ways to change background color of the container view
the first is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.view.backgroundColor = UIColor.white
}
and the second way is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.changecolor()
}
and in vc2
func changecolor()
{
print(123)
self.view.backgroundColor = UIColor.purple
}
it will print 123 but not change bg color
How can I change the content in other view controller ? (If I don't want to remove the current container view and change to another one)
ios swift
asked Nov 15 at 19:22
Jeffese
92
I am new to swift and ios developer. And I want to create a side menu that the cell event will dynamically change the content in a container view. But it seems not work.
the left is the tableview(my side menu) and the right is the container view with a viewcontroller(vc2) on it
I try two ways to change background color of the container view
the first is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.view.backgroundColor = UIColor.white
}
and the second way is
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.changecolor()
}
and in vc2
func changecolor()
{
print(123)
self.view.backgroundColor = UIColor.purple
}
it will print 123 but not change bg color
How can I change the content in other view controller ? (If I don't want to remove the current container view and change to another one)
ios swift
ios swift
asked Nov 15 at 19:22
Jeffese
92
asked Nov 15 at 19:22
Jeffese
92
asked Nov 15 at 19:22
Jeffese
92
asked Nov 15 at 19:22
Jeffese
92
asked Nov 15 at 19:22
Jeffese
92
92
It is the same situation with a segue: when you perform segue, UI elements (as IBOutlets) of destination are not yet set, so you cannot change them. That's why you need to set a property in destination and use this property after loading, or at viewWillAppear or viewDidAppear time.
– claude31
Nov 15 at 20:11
@claude31 But my vc2 is above the table view.I just push the x position of what above the table view to right.Didn’t the vc2 load already?(I can also click the bar item on it)
– Jeffese
Nov 16 at 2:26
Don't understand : in didSelectRow, you instantiate the VC2. Why, if it is already there ?
– claude31
Nov 17 at 8:05
add a comment |
It is the same situation with a segue: when you perform segue, UI elements (as IBOutlets) of destination are not yet set, so you cannot change them. That's why you need to set a property in destination and use this property after loading, or at viewWillAppear or viewDidAppear time.
– claude31
Nov 15 at 20:11
@claude31 But my vc2 is above the table view.I just push the x position of what above the table view to right.Didn’t the vc2 load already?(I can also click the bar item on it)
– Jeffese
Nov 16 at 2:26
Don't understand : in didSelectRow, you instantiate the VC2. Why, if it is already there ?
– claude31
Nov 17 at 8:05
It is the same situation with a segue: when you perform segue, UI elements (as IBOutlets) of destination are not yet set, so you cannot change them. That's why you need to set a property in destination and use this property after loading, or at viewWillAppear or viewDidAppear time.
– claude31
Nov 15 at 20:11
It is the same situation with a segue: when you perform segue, UI elements (as IBOutlets) of destination are not yet set, so you cannot change them. That's why you need to set a property in destination and use this property after loading, or at viewWillAppear or viewDidAppear time.
– claude31
Nov 15 at 20:11
@claude31 But my vc2 is above the table view.I just push the x position of what above the table view to right.Didn’t the vc2 load already?(I can also click the bar item on it)
– Jeffese
Nov 16 at 2:26
@claude31 But my vc2 is above the table view.I just push the x position of what above the table view to right.Didn’t the vc2 load already?(I can also click the bar item on it)
– Jeffese
Nov 16 at 2:26
Don't understand : in didSelectRow, you instantiate the VC2. Why, if it is already there ?
– claude31
Nov 17 at 8:05
Don't understand : in didSelectRow, you instantiate the VC2. Why, if it is already there ?
– claude31
Nov 17 at 8:05
add a comment |
1 Answer
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func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.setColor(UIColor.purple)
}
class ViewController2: UIViewController {
private(set) var color:UIColor?
override func viewDidLoad() {
guard let color = self.color else { return }
self.view.backgroundColor = color
}
func setColor(_ color:UIColor) {
self.color = color
}
}
answered Nov 15 at 19:30
impression7vx
6991734
add a comment |
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func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.setColor(UIColor.purple)
}
class ViewController2: UIViewController {
private(set) var color:UIColor?
override func viewDidLoad() {
guard let color = self.color else { return }
self.view.backgroundColor = color
}
func setColor(_ color:UIColor) {
self.color = color
}
}
answered Nov 15 at 19:30
impression7vx
6991734
add a comment |
up vote
0
down vote
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.setColor(UIColor.purple)
}
class ViewController2: UIViewController {
private(set) var color:UIColor?
override func viewDidLoad() {
guard let color = self.color else { return }
self.view.backgroundColor = color
}
func setColor(_ color:UIColor) {
self.color = color
}
}
answered Nov 15 at 19:30
impression7vx
6991734
add a comment |
up vote
0
down vote
up vote
0
down vote
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.setColor(UIColor.purple)
}
class ViewController2: UIViewController {
private(set) var color:UIColor?
override func viewDidLoad() {
guard let color = self.color else { return }
self.view.backgroundColor = color
}
func setColor(_ color:UIColor) {
self.color = color
}
}
answered Nov 15 at 19:30
impression7vx
6991734
func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2") as? ViewController2
vc2?.setColor(UIColor.purple)
}
class ViewController2: UIViewController {
private(set) var color:UIColor?
override func viewDidLoad() {
guard let color = self.color else { return }
self.view.backgroundColor = color
}
func setColor(_ color:UIColor) {
self.color = color
}
}
answered Nov 15 at 19:30
impression7vx
6991734
answered Nov 15 at 19:30
impression7vx
6991734
answered Nov 15 at 19:30
impression7vx
6991734
answered Nov 15 at 19:30
impression7vx
6991734
6991734
add a comment |
add a comment |
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It is the same situation with a segue: when you perform segue, UI elements (as IBOutlets) of destination are not yet set, so you cannot change them. That's why you need to set a property in destination and use this property after loading, or at viewWillAppear or viewDidAppear time.
– claude31
Nov 15 at 20:11
@claude31 But my vc2 is above the table view.I just push the x position of what above the table view to right.Didn’t the vc2 load already?(I can also click the bar item on it)
– Jeffese
Nov 16 at 2:26
Don't understand : in didSelectRow, you instantiate the VC2. Why, if it is already there ?
– claude31
Nov 17 at 8:05