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xy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
1 #import "ViewController.h"
2 typedef enum
3 {
4 buttonTypeLeft=1,
5 buttonTypeRight,
6 buttonTypeUp,
7 buttonTypeDown,
8 buttonTypeRotateL,
9 buttonTypeRotateR,
10 buttonTypeScaleUp,
11 buttonTypeScaleDown,
12
13 }buttonType;
14 @interface ViewController ()
15 @property (weak, nonatomic) IBOutlet UIView *viewMan;
16
17 @end
18
19 @implementation ViewController
20 //移动方向
21 - (IBAction)buttonDirectionClicked:(UIButton *)sender
22 {
23 //父视图的长度和高度
24 NSInteger screenWidth = self.view.frame.size.width;
25 NSInteger screenHeight = self.view.frame.size.height;
26
27 //子视图
28 CGRect rect = self.viewMan.frame;
29 //每次移动距离
30 NSInteger offset = 5;
31 //父控件通过tag标识获取视图中子控件(组件)
32 switch (sender.tag)
33 {
34 case buttonTypeDown:
35 rect.origin.y += offset;
36 if(rect.origin.y >= screenHeight)
37 {
38 rect.origin.y = -rect.size.height;
39 }
40 break;
41 case buttonTypeUp:
42 rect.origin.y -= offset;
43 if(rect.origin.y <= -rect.size.height)
44 {
45 rect.origin.y = screenHeight;
46 }
47 break;
48 case buttonTypeLeft:
49 rect.origin.x -= offset;
50 if(rect.origin.x <= -rect.size.width)
51 {
52 rect.origin.x = screenWidth;
53 }
54 break;
55 case buttonTypeRight:
56 rect.origin.x += offset;
57 if(rect.origin.x >= screenWidth)
58 {
59 rect.origin.x = -rect.size.width;
60 }
61 break;
62 }
63 self.viewMan.frame = rect;
64 }
65
66 //旋转
67 - (IBAction)buttonRotateClicked:(UIButton *)sender
68 {
69 //子视图这个控件的坐标矩阵
70 CGAffineTransform form = self.viewMan.transform;
71 switch (sender.tag) {
72 case buttonTypeRotateL:
73 form = CGAffineTransformRotate(form, -M_2_PI/2);
74 break;
75 case buttonTypeRotateR:
76 form = CGAffineTransformRotate(form, M_2_PI/2);
77 break;
78 }
79 self.viewMan.transform = form;
80 }
81
82 //放缩
83 - (IBAction)buttonScaleClicked:(UIButton *)sender
84 {
85 //子视图这个控件的坐标矩阵
86 CGAffineTransform form = self.viewMan.transform;
87 CGFloat scaleFator = 0.0f;
88
89 switch (sender.tag) {
90 case buttonTypeScaleUp:
91 scaleFator = 1.2;
92 break;
93 case buttonTypeScaleDown:
94 scaleFator = 0.8;
95 break;
96 }
97 form = CGAffineTransformScale(form, scaleFator, scaleFator);
98 self.viewMan.transform = form;
99 }
100
101 - (void)viewDidLoad {
102 [super viewDidLoad];
103 // Do any additional setup after loading the view, typically from a nib.
104 }
105
106 - (void)didReceiveMemoryWarning {
107 [super didReceiveMemoryWarning];
108 // Dispose of any resources that can be recreated.
109 }
110
111 @end