IOS basic learning UIButton Usage Details

IOS basic learning UIButton Usage Details

The UIButton button is the most commonly used control in IOS development. As a basic knowledge of IOS learning, beginners need to understand its basic definition and common settings so that they can be used in development.

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