iOS开发基础篇-手写控件

一、手写控件的步骤

　　1）使用相应的控件类创建控件对象；

　　2）设置该控件的各种属性；

　　3）添加空间到视图中；

　　4）如果是 UIButton 等控件，还需考虑控件的单击事件等；

二、添加 UIButton 单击事件

　　 [topbtn addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];

　　1） addTarget:forControlEvents: 方法定义在 UIControl 类中，意味着所有继承自 UIControl 类的对象均可添加；

　　2）第一个参数为对象本身；

　　3）第二个参数为监听控件的事件。

 @interface ViewController ()
 @property (nonatomic, weak) IBOutlet UIButton *headImageView;　　//被控制用于移动的按钮
 @end

 //手工添加上下左右、放大缩小按钮
 1 - (void)viewDidLoad {
     [super viewDidLoad];
     //设置按钮对象为自定义型
     UIButton *headbtn = [UIButton buttonWithType:UIButtonTypeCustom];
     //设置按钮对象普通状态下的各项属性
     headbtn.frame = CGRectMake(, , , );
     [headbtn setBackgroundImage:[UIImage imageNamed:@"beauty10"] forState:UIControlStateNormal];
     [headbtn setTitle:@"点我！" forState:UIControlStateNormal];
     [headbtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
     //设置按钮对象高亮状态下的属性
     [headbtn setBackgroundImage:[UIImage imageNamed:@"beauty11"] forState:UIControlStateHighlighted];
     [headbtn setTitle:@"还行吧~~" forState:UIControlStateHighlighted];
     [headbtn setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];
     //将按钮对象添加到视图中显示出来
     [self.view addSubview:headbtn];
     self.headImageView = headbtn;　　//建立IBOutlet连接

     //向上移动的按钮
     UIButton *topbtn = [UIButton buttonWithType:UIButtonTypeCustom];
     topbtn.frame = CGRectMake(, , , );
     [topbtn setTitle:@"上移" forState:UIControlStateNormal];
     [topbtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
     [topbtn setTag:];
     [self.view addSubview:topbtn];
     //添加按钮的单击事件
     [topbtn addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];

     //向下移动的按钮
     UIButton *downbtn = [UIButton buttonWithType:UIButtonTypeCustom];
     downbtn.frame = CGRectMake(, , , );
     [downbtn setTitle:@"下移" forState:UIControlStateNormal];
     [downbtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
     [downbtn setTag:];
     [self.view addSubview:downbtn];
     //添加按钮的单击事件
     [downbtn addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];

     //向左移动的按钮
     UIButton *leftbtn = [UIButton buttonWithType:UIButtonTypeCustom];
     leftbtn.frame = CGRectMake(, , , );
     [leftbtn setTitle:@"左移" forState:UIControlStateNormal];
     [leftbtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
     [leftbtn setTag:];
     [self.view addSubview:leftbtn];
     //添加按钮的单击事件
     [leftbtn addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];

     //向右移动的按钮
     UIButton *rightbtn = [UIButton buttonWithType:UIButtonTypeCustom];
     rightbtn.frame = CGRectMake(, , , );
     [rightbtn setTitle:@"右移" forState:UIControlStateNormal];
     [rightbtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
     [rightbtn setTag:];
     [self.view addSubview:rightbtn];
     //添加按钮的单击事件
     [rightbtn addTarget:self action:@selector(move:) forControlEvents:UIControlEventTouchUpInside];

     //放大的按钮
     UIButton *zoombtn = [UIButton buttonWithType:UIButtonTypeCustom];
     zoombtn.frame = CGRectMake(, , , );
     [zoombtn setTitle:@"放大" forState:UIControlStateNormal];
     [zoombtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
     [zoombtn setTag:];
     [self.view addSubview:zoombtn];
     //添加按钮的单击事件
     [zoombtn addTarget:self action:@selector(zoom:) forControlEvents:UIControlEventTouchUpInside];

     //缩小的按钮
     UIButton *minusbtn = [UIButton buttonWithType:UIButtonTypeCustom];
     minusbtn.frame = CGRectMake(, , , );
     [minusbtn setTitle:@"缩小" forState:UIControlStateNormal];
     [minusbtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
     [minusbtn setTag:];
     [self.view addSubview:minusbtn];
     //添加按钮的单击事件
     [minusbtn addTarget:self action:@selector(zoom:) forControlEvents:UIControlEventTouchUpInside];
 }

　　先声明上下左右移动的枚举类型，及移动或放大缩小的常量值：

 //ViewController.m
 typedef NS_ENUM(NSUInteger, kMovingDir)
 {
     kMovingDirTop = ,
     kMovingDirButtom,
     kMovingDirLeft,
     kMovingDirRight,
 };

 CGFloat const kMovingDelta = 50.0;      //移动系数
 CGFloat const kZoomingDelta = 50.0;     //放大缩小系数

　　实现按钮的事件：

 - (void)move:(id)sender {
     UIButton *button = (UIButton *)sender;

     CGPoint p = self.headImageView.center;
     switch (button.tag) {
         case kMovingDirTop: p.y -= kMovingDelta; break;  //往上移动
         case kMovingDirButtom: p.y += kMovingDelta; break;  //往下移动
         case kMovingDirLeft: p.x -= kMovingDelta; break; //往左移动
         case kMovingDirRight: p.x += kMovingDelta; break; //往右移动
     }

     [UIView beginAnimations:nil context:nil];
     [UIView setAnimationDuration:2.0];
     self.headImageView.center = p;
     [UIView commitAnimations];
 }

 - (void)zoom:(id)sender {
     UIButton *button = (UIButton *)sender;

     CGRect rect = self.headImageView.bounds;
     if (button.tag) {   //缩小
         rect.size.width -= kZoomingDelta;
         rect.size.height -= kZoomingDelta;
     } else {            //放大
         rect.size.width += kZoomingDelta;
         rect.size.height += kZoomingDelta;
     }

     [UIView beginAnimations:nil context:nil];
     [UIView setAnimationDuration:2.0];
     self.headImageView.bounds = rect;
     [UIView commitAnimations];
 }

示图如下：

示例代码：http://pan.baidu.com/s/1i3SainN

三、简单的动画

　　1）开始动画；

　　2）设置动画相关的参数，如时间等；

　　3）参与动画的行动

　　4）提交动画。

示例代码如下：

     [UIView beginAnimations:nil context:nil];
     [UIView setAnimationDuration:2.0];
     self.headImageView.bounds = rect;
     [UIView commitAnimations];

参考博客：iOS开发UI基础—手写控件，frame，center和bounds属性