http://www.cnblogs.com/XYQ-208910/p/4761646.html
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：
CGAffineTransformCGAffineTransformConcat(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：
1#import"ViewController.h"
2typedefenum
3{
4buttonTypeLeft=1,
5buttonTypeRight,
6buttonTypeUp,7buttonTypeDown,8buttonTypeRotateL,9buttonTypeRotateR,10buttonTypeScaleUp,11buttonTypeScaleDown,1213}buttonType;14@interfaceViewController ()
15@property (weak, nonatomic) IBOutlet UIView *viewMan;
1617@end
1819@implementationViewController
20//移动方向
21- (IBAction)buttonDirectionClicked:(UIButton *)sender22{23//父视图的长度和高度24NSInteger screenWidth =self.view.frame.size.width;25NSInteger screenHeight =self.view.frame.size.height;2627//子视图28CGRect rect =self.viewMan.frame;29//每次移动距离30NSInteger offset =5;31//父控件通过tag标识获取视图中子控件(组件)32switch(sender.tag)33{34casebuttonTypeDown:35rect.origin.y +=offset;36if(rect.origin.y >=screenHeight)37{38rect.origin.y = -rect.size.height;39}40break;41casebuttonTypeUp:42rect.origin.y -=offset;43if(rect.origin.y <= -rect.size.height)44{45rect.origin.y =screenHeight;46}47break;48casebuttonTypeLeft:49rect.origin.x -=offset;50if(rect.origin.x <= -rect.size.width)51{52rect.origin.x =screenWidth;53}54break;55casebuttonTypeRight:56rect.origin.x +=offset;57if(rect.origin.x >=screenWidth)58{59rect.origin.x = -rect.size.width;60}61break;62}63self.viewMan.frame =rect;64}6566//旋转67- (IBAction)buttonRotateClicked:(UIButton *)sender68{69//子视图这个控件的坐标矩阵70CGAffineTransform form =self.viewMan.transform;71switch(sender.tag) {72casebuttonTypeRotateL:73form = CGAffineTransformRotate(form, -M_2_PI/2);
74break;
75casebuttonTypeRotateR:
76form = CGAffineTransformRotate(form, M_2_PI/2);77break;78}
79self.viewMan.transform =form;80}
8182//放缩
83- (IBAction)buttonScaleClicked:(UIButton *)sender
84{85//子视图这个控件的坐标矩阵
86CGAffineTransform form =self.viewMan.transform;
87CGFloat scaleFator =0.0f;
8889switch(sender.tag) {
90casebuttonTypeScaleUp；
91scaleFator =1.2;
92break;
93casebuttonTypeScaleDown:
94scaleFator =0.8;
95break;
96}
97form =CGAffineTransformScale(form, scaleFator, scaleFator);
98self.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
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