Basic definitions and common settings that UIButton, UILabel, and UITextField beginners need to understand. uibuttonuilabel

Basic definitions and common settings that UIButton, UILabel, and UITextField beginners need to understand. uibuttonuilabel

The following are the most commonly used controls in IOS development. As a basic learning tutorial for IOS, beginners need to understand the basic definition and frequently used settings to be used in development.

UIButtonButton

1. UIButton Definition

UIButton * button = [[UIButton buttonWithType :( UIButtonType );

The following six types of buttons can be defined,

Typedef enum {

UIButtonTypeCustom = 0, custom Style

UIButtonTypeRoundedRect, rounded rectangle

UIButtonTypeDetailDisclosure, blue arrow button, mainly used for detailed description

UIButtonTypeInfoLight, brilliant exclamation point

UIButtonTypeInfoDark, dark exclamation point

UIButtonTypeContactAdd, plus sign

} UIButtonType;

2. Set frame

Button1.frame = CGRectMake (20, 20,280, 40 );

[Button setFrame: CGRectMake (20, 20, 50, 50)];

Third, button background color

Button1.backgroundColor = [UIColor clearColor];

[Button setBackgroundColor: [UIColor blueColor];

4. state

ForState: this parameter defines the status in which the text or image of a button appears.

Enum {

UIControlStateNormal = 0, the general status is displayed

UIControlStateHighlighted = 1 <0, highlighted

UIControlStateDisabled = 1 <1, the disabled status is displayed.

UIControlStateSelected = 1 <2, selected

UIControlStateApplication = 0x00FF0000, when the application flag

UIControlStateReserved = 0xFF000000 is reserved for the internal framework.

};

@ Property (nonatomic, getter = isEnabled) BOOL enabled; // default is YES. if NO, ignores touch events and subclasses may draw differently

@ Property (nonatomic, getter = isSelected) BOOL selected; // default is NO may be used by some subclasses or by application

@ Property (nonatomic, getter = isHighlighted) BOOL highlighted;

Fifth, set the button to fill in the image and background image

[ButtonsetImage: [UIImageimageNamed: @ "checkmarkControllerIcon"] forState: UIControlStateNormal];

[ButtonsetBackgroundImage: [UIImageimageNamed: @ "checkmarkControllerIcon"] forState: UIControlStateNormal];

6. Set the button title and title Color

[Button1 setTitle: @ "click" forState: UIControlStateNormal];

[ButtonsetTitleColor: [UIColorredColor] forState: UIControlStateNormal];

Seventh, the setting button will shine

Button. showsTouchWhenHighlighted = NO;

8. add or delete events

[Button1 addTarget: self action: @ selector (butClick :) forControlEvents: UIControlEventTouchUpInside];

[Btn removeTarget: nil action: nil forControlEvents: UIControlEventTouchUpInside];

9. Set the image spacing and title spacing inside the button.

UIEdgeInsets insets; // you can specify the image spacing in the buttons.

Insets. top = insets. bottom = insets. right = insets. left = 10;

Bt. contentEdgeInsets = insets;

Bt. titleEdgeInsets = insets; // Title spacing

10. Others

// The set button is invalid. If the button is invalid, the button no longer responds to the user.

Btn. enabled = YES;

// Add a gesture reader to the button

[Btn addGestureRecognizer: tap];

// Add a button, for example

UIButton * calBtn = [[UIButton alloc] initWithFrame: CGRectMake (50,200,200, 40)]; // button size

CalBtn. backgroundColor = [UIColor orangeColor]; // background color

[CalBtn setTitle: @ "Click me, and I will calculate" forState: UIControlStateNormal]; // set the text in the default state

[CalBtn setTitle: @ "Click me, and I will calculate" forState: UIControlStateHighlighted]; // set the text in the highlighted state

[CalBtn setBackgroundImage: [UIImage imageNamed: @ "login_btn_n_Normal"] forState: UIControlStateNormal]; // sets the background image in the default state.

[CalBtn setBackgroundImage: [UIImage imageNamed: @ "logoff_btn_n_Highlighted"] forState: UIControlStateHighlighted]; // sets the background image in the highlighted state.

[Self. view addSubview: calBtn]; // you must add a button.

[Note] the image name should be modified in advance. It is best to add a word to the end to identify whether it is a default or highlighted state.

 

UILabelTag

UILabel * lbl = [[UILabel alloc] initWithFrame: CGRectMake (50,100,300,160)]; // size

Lbl. backgroundColor = [UIColor lightGrayColor]; // background color

Lbl. textColor = [UIColor blueColor]; // font color

// Lbl. shadowColor = [UIColor redColor]; // shadow effect, not commonly used

// Lbl. shadowOffset = CGSizeMake (4,-10 );

Lbl. text = @ "dormitory"; // Add text

// TAG content alignment

Lbl. textAlignment = NSTextAlignmentCenter;

// Set the number of rows of the tag. If it is set to 0, there can be any number of rows.

Lbl. numberOfLines = 2;

// When the label has multiple rows, set the line feed mode. The default unit is words.

Lbl. lineBreakMode = NSLineBreakByTruncatingMiddle; // if it cannot be fully displayed, there will be three dots in the middle

// Set the label highlight status

Lbl. highlighted = YES;

// Set the font color when the label is highlighted

Lbl. highlightedTextColor = [UIColor purpleColor];

// Allows users to interact with tags

Lbl. userInteractionEnabled = YES; // allows user interaction

// Define a click gesture identifier object

UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (lblClicked :)];

// Add a gesture identification device to the tag

[Lbl addGestureRecognizer: tap];

// Lbl. enabled = NO;

Lbl. adjustsFontSizeToFitWidth = YES;

// Lbl. baselineAdjustment = UIBaselineAdjustmentAlignCenters;

[Self. view addSubview: lbl]; // The control must be added at the end.

[Summary] You can try the following,