iOS开发UI基础—手写控件，frame，center和bounds属性

//
//  YYViewController.m
//  01-练习使用按钮的frame和center属性
//
//  Created by apple on 14-5-21.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYViewController.h"

//私有扩展
@interface YYViewController ()

@property(nonatomic,weak)IBOutlet UIButton *headImageView;
@end

@implementation YYViewController

//枚举类型，从1开始
typedef enum
{
    ktopbtntag=1,
    kdownbtntag,
    krightbtntag,
    kleftbtntag
}btntag;

//viewDidLoad是视图加载完成后调用的方法，通常在此方法中执行视图控制器的初始化工作
- (void)viewDidLoad
{
    
    //在viewDidLoad方法中，不要忘记调用父类的方法实现
    [super viewDidLoad];

    
    //手写控件代码
    //一、写一个按钮控件，上面有一张图片
    
    //1.使用类创建一个按钮对象
   // UIButton *headbtn=[[UIButton alloc] initWithFrame:CGRectMake(100 ,100, 100, 100)];
    //设置按钮对象为自定义型
    UIButton *headbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    
    //2.设置对象的各项属性
    //(1)位置等通用属性设置
    headbtn.frame=CGRectMake(100, 100, 100, 100);
    
    //(2)设置普通状态下按钮的属性
    [headbtn setBackgroundImage:[UIImage imageNamed:@"i"] forState:UIControlStateNormal];
    [headbtn setTitle:@"点我！" forState:UIControlStateNormal];
    [headbtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    
    //(3)设置高亮状态下按钮的属性
    [headbtn setBackgroundImage:[UIImage imageNamed:@"a"] forState:UIControlStateHighlighted];
    [headbtn setTitle:@"还行吧~" forState:UIControlStateHighlighted];
    [headbtn setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];
    
    //3.把对象添加到视图中展现出来
    [self.view addSubview:headbtn];
    //注意点！
    self.headImageView=headbtn;

    
    //二、写四个控制图片左右上下移动方向的按钮控件
    
    /**================向上的按钮=====================*/
    //1.创建按钮对象
    UIButton *topbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    
    //2.设置对象的属性
    topbtn.frame=CGRectMake(100, 250, 40, 40);
    [topbtn setBackgroundImage:[UIImage imageNamed:@"top_normal"] forState:UIControlStateNormal];
    [topbtn setBackgroundImage:[UIImage imageNamed:@"top_highlighted"] forState:UIControlStateHighlighted];
    [topbtn setTag:1];
    //3.把控件添加到视图中
    [self.view addSubview:topbtn];
    
    //4.按钮的单击控制事件
    [topbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
    
    
      /**================向下的按钮=====================*/
    //1.创建按钮对象
    UIButton *downbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    //2.设置对象的属性
    downbtn.frame=CGRectMake(100, 350, 40, 40);
    [downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_normal"] forState:UIControlStateNormal];
    [downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_highlighted"] forState:UIControlStateHighlighted];
    [downbtn setTag:2];
    //3.把控件添加到视图中
    [self.view addSubview:downbtn];
    
    //4.按钮的单击控制事件
    [downbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];

    
     /**================向左的按钮=====================*/
    //1.创建按钮对象
    UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    //2.设置对象的属性
    leftbtn.frame=CGRectMake(50, 300, 40, 40);
    [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
    [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
    [leftbtn setTag:4];
    //3.把控件添加到视图中
    [self.view addSubview:leftbtn];
    
    //4.按钮的单击控制事件
    [leftbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
    
    
    
    /**================向右的按钮=====================*/
    //1.创建按钮对象
    UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    //2.设置对象的属性
    rightbtn.frame=CGRectMake(150, 300, 40, 40);
    [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
    [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
    [rightbtn setTag:3];
    //3.把控件添加到视图中
    [self.view addSubview:rightbtn];
    
    //4.按钮的单击控制事件
    [rightbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
    
      //三、写两个缩放按钮
       /**================放大的按钮=====================*/
    //1.创建对象
    UIButton *plusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    //2.设置属性
    plusbtn.frame=CGRectMake(75, 400, 40, 40);
    [plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_normal"] forState:UIControlStateNormal];
    [plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_highlighted"] forState:UIControlStateHighlighted];
    [plusbtn setTag:1];
    //3.添加到视图
    [self.view addSubview:plusbtn];
    //4.单击事件
    [plusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];
    
    
    /**================缩小的按钮=====================*/
    UIButton *minusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
    minusbtn.frame=CGRectMake(125, 400, 40, 40);
    [minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_normal"] forState:UIControlStateNormal];
    [minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_highlighted"] forState:UIControlStateHighlighted];
    [minusbtn setTag:0];
    [self.view addSubview:minusbtn];
    [minusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];
}

//控制方向的多个按钮调用同一个方法
-(void)Click:(UIButton *)button
{

    //练习使用frame属性
    //CGRect frame=self.headImageView.frame;
    
    /**注意，这里如果控制位置的两个属性frame和center同时使用的话，会出现很好玩的效果，注意分析*/
    //练习使用center属性
    CGPoint center=self.headImageView.center;
    switch (button.tag) {
        case ktopbtntag:
            center.y-=30;
            break;
        case kdownbtntag:
            center.y+=30;
            break;
        case kleftbtntag:
            //发现一个bug,之前的问题是因为少写了break,造成了它们的顺序执行，sorry
           //center.x=center.x-30;
            center.x-=50;
            break;
        case krightbtntag:
            center.x+=50;
            break;
    }
    
 //  self.headImageView.frame=frame;
    
    //首尾式设置动画效果
    [UIView beginAnimations:nil context:nil];
    self.headImageView.center=center;
    //设置时间
    [UIView setAnimationDuration:2.0];
    [UIView commitAnimations];
    NSLog(@"移动!");
    
}
-(void)Zoom:(UIButton *)btn
{
    //使用frame，以自己的左上角（自己的原点）为原点
//    CGRect frame=self.headImageView.frame;
//    if (btn.tag) {
//        frame.size.height+=30;
//        frame.size.width+=30;
//    }
//    else
//    {
//        frame.size.width-=50;
//        frame.size.height-=50;
//    }
//    self.headImageView.frame=frame;
    
    
    //使用bounds，以中心点位原点进行缩放
    CGRect bounds = self.headImageView.bounds;
    if (btn.tag) {
        bounds.size.height+=30;
        bounds.size.width+=30;
    }
    else
    {
        bounds.size.height-=50;
        bounds.size.width-=50;
    }
    
    //设置首尾动画
    [UIView beginAnimations:nil context:nil];
    self.headImageView.bounds=bounds;
    [UIView setAnimationDuration:2.0];
    [UIView commitAnimations];
}
@end