iOS开发基础篇-手写控件

时间：2023-03-08 16:39:10

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：

iOS开发基础篇-手写控件

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

　　

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