The AppDelegate class contains a single property: window. With this property the app delegate keeps track of the window in which all of your app content is drawn. The window property is an optional, which means it may have no value (be nil) at some point.
var window: UIWindow?
Use the text field’s placeholder text to prompt the user to enter the name of a new meal.
(UIStackView). A stack view provides a streamlined interface for laying out a collection of views in either a column or a row.
Xcode wraps the UI elements in a stack view, stacking them together. Xcode analyzes your existing layout to figure out that the items should stack vertically, not horizontally.
Text fields are sized based on their contents, which define their intrinsic content size. Intrinsic content size refers to the minimum size needed to display all the content in the view.
To configure the text field’s keyboard
1 Make sure the text field is still selected.
2 In the Attributes inspector, find the field labeled Return Key and select Done.
This change will make the default Return key on the keyboard more pronounced to the user by changing it into a Done key.
3 In the Attributes inspector, select the Auto-enable Return Key checkbox.
This change makes it impossible for the user to tap the Done key before typing text into the text field, ensuring that users can never enter an empty string as a meal name.
At runtime, your storyboard will create an instance of ViewController, your custom view controller subclass.
The AppDelegate class contains a single property: window. With this property the app delegate keeps track of the window in which all of your app content is drawn. The window property is an optional, which means it may have no value (be nil) at some point.
var window: UIWindow?
Use the text field’s placeholder text to prompt the user to enter the name of a new meal.
(UIStackView). A stack view provides a streamlined interface for laying out a collection of views in either a column or a row.
Xcode wraps the UI elements in a stack view, stacking them together. Xcode analyzes your existing layout to figure out that the items should stack vertically, not horizontally.
Text fields are sized based on their contents, which define their intrinsic content size. Intrinsic content size refers to the minimum size needed to display all the content in the view.
To configure the text field’s keyboard
1 Make sure the text field is still selected.
2 In the Attributes inspector, find the field labeled Return Key and select Done.
This change will make the default Return key on the keyboard more pronounced to the user by changing it into a Done key.
3 In the Attributes inspector, select the Auto-enable Return Key checkbox.
This change makes it impossible for the user to tap the Done key before typing text into the text field, ensuring that users can never enter an empty string as a meal name.
At runtime, your storyboard will create an instance of ViewController, your custom view controller subclass.
The AppDelegate class contains a single property: window. With this property the app delegate keeps track of the window in which all of your app content is drawn. The window property is an optional, which means it may have no value (be nil) at some point.
var window: UIWindow?
Use the text field’s placeholder text to prompt the user to enter the name of a new meal.
(UIStackView). A stack view provides a streamlined interface for laying out a collection of views in either a column or a row.
Xcode wraps the UI elements in a stack view, stacking them together. Xcode analyzes your existing layout to figure out that the items should stack vertically, not horizontally.
Text fields are sized based on their contents, which define their intrinsic content size. Intrinsic content size refers to the minimum size needed to display all the content in the view.
To configure the text field’s keyboard
1 Make sure the text field is still selected.
2 In the Attributes inspector, find the field labeled Return Key and select Done.
This change will make the default Return key on the keyboard more pronounced to the user by changing it into a Done key.
3 In the Attributes inspector, select the Auto-enable Return Key checkbox.
This change makes it impossible for the user to tap the Done key before typing text into the text field, ensuring that users can never enter an empty string as a meal name.
At runtime, your storyboard will create an instance of ViewController, your custom view controller subclass.
The AppDelegate class contains a single property: window. With this property the app delegate keeps track of the window in which all of your app content is drawn. The window property is an optional, which means it may have no value (be nil) at some point.
var window: UIWindow?
Use the text field’s placeholder text to prompt the user to enter the name of a new meal.
(UIStackView). A stack view provides a streamlined interface for laying out a collection of views in either a column or a row.
Xcode wraps the UI elements in a stack view, stacking them together. Xcode analyzes your existing layout to figure out that the items should stack vertically, not horizontally.
Text fields are sized based on their contents, which define their intrinsic content size. Intrinsic content size refers to the minimum size needed to display all the content in the view.
To configure the text field’s keyboard
1 Make sure the text field is still selected.
2 In the Attributes inspector, find the field labeled Return Key and select Done.
This change will make the default Return key on the keyboard more pronounced to the user by changing it into a Done key.
3 In the Attributes inspector, select the Auto-enable Return Key checkbox.
This change makes it impossible for the user to tap the Done key before typing text into the text field, ensuring that users can never enter an empty string as a meal name.
At runtime, your storyboard will create an instance of ViewController, your custom view controller subclass.
原文：http://www.cnblogs.com/yshgxm/p/5435878.html