iOS:UIView视图与组件控件

一、UIView常见属性

 (1)@property(nonatomic,readonly)UIView *superview; //获取自己的父控件对象

 (2)@property(nonatomic,readonly,copy)UIView *subviews;//获取自己的所有子控件对象

 (3)@property(nonatomic)NSInteger tag;//控件的ID标识,父控件可以通过tag来找到对应的子控件,默认为0 

 (4)@property(nonatomic) CGRect frame;//控件所在矩形框的位置和尺寸(以父控件的左上角为坐标原点）

 (5)@property(nonatomic) CGRect bounds;//控件所在矩形框的位置和尺寸（以自己左上角为坐标原点，所    以bounds的x\y永远为0）

 (6)@property(nonatomic) CGPoint center;//控件中点的位置（以父控件的左上角为坐标原点）

 (7)@property(nonatomic) CGAffineTransform transform;//控件的形变属性（可以设置旋转角度、比例缩放、平移等属性）

a.旋转：CGAffineTransform CGAffineTransformScale(CGAffineTransform t,  CGFloat sx, CGFloat sy) 

sx和sy为坐标放缩倍数

b.放缩：CGAffineTransform CGAffineTransformRotate(CGAffineTransform t,CGFloat angle) 

angle:旋转度数

c.反转：CGAffineTransform CGAffineTransformInvert(CGAffineTransform t)

 

        d. 两个矩阵仿射为一个新的矩阵：

             CGAffineTransform  CGAffineTransformConcat(CGAffineTransform t1,CGAffineTransform t2)

 

e.判断两个矩阵是否相等：

     bool CGAffineTransformEqualToTransform(CGAffineTransform t1, CGAffineTransform t2)

 

创建一个仿射矩阵

• CGAffineTransformMake 直接赋值来创建
• CGAffineTransformMakeRotation 设置角度来生成矩阵
• 结果就是
• CGAffineTransformMakeScale  设置缩放，及改变a、d的值
• CGAffineTransformMakeTranslation  设置偏移

改变已经存在的放射矩阵

• CGAffineTransformTranslate  原始的基础上加上偏移
• CGAffineTransformScale加上缩放
• CGAffineTransformRotate加上旋转
• CGAffineTransformInvert 反向的仿射矩阵比如（x，y）通过矩阵t得到了（x',y'）那么通过这个函数生成的t'作用与（x',y'）就能得到原始的(x,y)
• CGAffineTransformConcat 通过两个已经存在的放射矩阵生成一个新的矩阵t' = t1 * t2

应用仿射矩阵

• CGPointApplyAffineTransform 得到新的点
• CGSizeApplyAffineTransform  得到新的size
• CGRectApplyAffineTransform  得到新的rect

 

 

视图view的组件图框frame的类型为CGRect结构体

struct CGRect

{

CGPoint origin;

CGSize size;

};

struct CGPonit

{

CGFloat x;

CGFloat y;

};

struct CGSize

{

CGFloat width;

CGFloat height;

};

 

视图view的组件形变控件transform的类型为CGAffineTransform结构体,就是一个矩阵(可以伸缩、平移、旋转等)

struct CGAffineTransform {

CGFloat a, b, c, d;

CGFloat tx, ty;

};

二、UIButton的初始化

 

–最普通的初始化方法

UIButton *btn = [[UIButton alloc] initWithFrame:rect];

–快速初始化

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

–type参数用来指定按钮的类型，一共有6种选择：

•UIButtonTypeCustom：无类型，按钮的内容需要自定义

•UIButtonTypeRoundedRect：圆矩形边框  

•UIButtonTypeDetailDisclosure： 

•UIButtonTypeInfoLight： 

•UIButtonTypeInfoDark： 

•UIButtonTypeContactAdd：

　　　　作品：boxMan

 #import "ViewController.h"
 typedef enum
 {
     buttonTypeLeft=,
     buttonTypeRight,
     buttonTypeUp,
     buttonTypeDown,
     buttonTypeRotateL,
     buttonTypeRotateR,
     buttonTypeScaleUp,
     buttonTypeScaleDown,

 }buttonType;
 @interface ViewController ()
 @property (weak, nonatomic) IBOutlet UIView *viewMan;

 @end

 @implementation ViewController
 //移动方向
 - (IBAction)buttonDirectionClicked:(UIButton *)sender
 {
     //父视图的长度和高度
     NSInteger screenWidth = self.view.frame.size.width;
     NSInteger screenHeight = self.view.frame.size.height;

     //子视图
     CGRect rect = self.viewMan.frame;
     //每次移动距离
     NSInteger offset = ;
     //父控件通过tag标识获取视图中子控件(组件)
     switch (sender.tag)
     {
         case buttonTypeDown:
             rect.origin.y += offset;
             if(rect.origin.y >= screenHeight)
             {
                 rect.origin.y = -rect.size.height;
             }
             break;
         case buttonTypeUp:
             rect.origin.y -= offset;
             if(rect.origin.y <= -rect.size.height)
             {
                 rect.origin.y = screenHeight;
             }
             break;
         case buttonTypeLeft:
             rect.origin.x -= offset;
             if(rect.origin.x <= -rect.size.width)
             {
                 rect.origin.x = screenWidth;
             }
             break;
         case buttonTypeRight:
             rect.origin.x += offset;
             if(rect.origin.x >= screenWidth)
             {
                 rect.origin.x = -rect.size.width;
             }
             break;
     }
     self.viewMan.frame = rect;
 }

 //旋转
 - (IBAction)buttonRotateClicked:(UIButton *)sender
 {
     //子视图这个控件的坐标矩阵
     CGAffineTransform form =  self.viewMan.transform;
     switch (sender.tag) {
         case buttonTypeRotateL:
             form = CGAffineTransformRotate(form, -M_2_PI/);
             break;
         case buttonTypeRotateR:
             form = CGAffineTransformRotate(form, M_2_PI/);
             break;
     }
     self.viewMan.transform = form;
 }

 //放缩
 - (IBAction)buttonScaleClicked:(UIButton *)sender
 {
     //子视图这个控件的坐标矩阵
     CGAffineTransform form = self.viewMan.transform;
     CGFloat scaleFator = 0.0f;

     switch (sender.tag) {
         case buttonTypeScaleUp:
             scaleFator = 1.2;
             break;
         case buttonTypeScaleDown:
             scaleFator = 0.8;
             break;
     }
     form = CGAffineTransformScale(form, scaleFator, scaleFator);
     self.viewMan.transform = form;
 }

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end