UI基础第一天（代码）

编程任务：

        设计可以移动和缩放图片的APP，如下图，掌握按钮的常见属性和常见方法。

                                    

方法一：利用frame属性，对图片的位置和大小进行更改。

#import "ViewController.h"

@interface ViewController ()
//私有属性
@property (nonatomic,weak) IBOutlet UIButton* photoButton;

//调整frame
-(void)frameX:(CGFloat)x Y:(CGFloat)y height:(CGFloat)h width:(CGFloat)w;

//向上移动
-(IBAction)up;

//向下移动
-(IBAction)down;

//向左移动
-(IBAction)left;

//向右移动
-(IBAction)right;

//缩小
-(IBAction)small;

//放大
-(IBAction)big;

@end

@implementation ViewController

//调整frame
-(void)frameX:(CGFloat)x Y:(CGFloat)y height:(CGFloat)h width:(CGFloat)w{
    //取出photoButton的frame
    CGRect frame = self.photoButton.frame;
    //调整frame
    frame.origin.x = frame.origin.x + x;
    frame.origin.y = frame.origin.y + y;
    frame.size.height = frame.size.height + h;
    frame.size.width = frame.size.width + w;
    //更新photoButton的frame
    self.photoButton.frame = frame;
}

//向上移动
-(IBAction)up{
    [self frameX:0 Y:-10 height:0 width:0];
}

//向下移动
-(IBAction)down{
    [self frameX:0 Y:+10 height:0 width:0];
}

//向左移动
-(IBAction)left{
    [self frameX:-10 Y:0 height:0 width:0];
}

//向右移动
-(IBAction)right{
    [self frameX:+10 Y:0 height:0 width:0];
}

//缩小
-(IBAction)small{
    [self frameX:0 Y:0 height:-10 width:-10];
}

//放大
-(IBAction)big{
    [self frameX:0 Y:0 height:+10 width:+10];
}

@end

方法二：利用tag，center，bounds属性，使用开关语句，对图片的位置和大小进行更改

#import "ViewController.h"

@interface ViewController ()
//私有属性
@property (nonatomic,weak) IBOutlet UIButton* photoButton;

//调整位置
- (IBAction) move:(UIButton *) sender;

//调整大小
- (IBAction) size:(UIButton *) sender;

@end

@implementation ViewController
//调整位置
- (IBAction) move:(UIButton *) sender{
    //取出center
    CGPoint center = self.photoButton.center;
    //调整center
    switch (sender.tag) {
        case 1:
            center.y -= 10;
            break;
        case 2:
            center.y += 10;
            break;
        case 3:
            center.x -= 10;
            break;
        case 4:
            center.x += 10;
            break;
        default:
            break;
    }
    //更新center
    self.photoButton.center = center;
}

//调整大小
- (IBAction) size:(UIButton *) sender{
    //取出bounds，调整bounds，图片是以自己中心进行缩放
    CGRect bounds = self.photoButton.bounds;
    //调整bounds
    switch (sender.tag) {
        case 5:
            bounds.size.width -= 10;
            bounds.size.height -= 10;
            break;
        case 6:
            bounds.size.width += 10;
            bounds.size.height += 10;
            break;
        default:
            break;
    }
    //更新bounds
    self.photoButton.bounds = bounds;
}

@end

方法三：利用tag，transform属性，使用开关语句和相关的C函数，对图片的位置和大小进行更改

#import "ViewController.h"

@interface ViewController ()
//私有属性
@property (nonatomic,weak) IBOutlet UIButton* photoButton;

//调整位置
- (IBAction) move:(UIButton *) sender;

//调整大小
- (IBAction) size:(UIButton *) sender;

//旋转图片
-(IBAction) rotate:(UIButton *)sender;

@end

@implementation ViewController

//调整位置
- (IBAction) move:(UIButton *) sender{
    //设置移动距离
    CGPoint moveTo = {0,0};
    switch (sender.tag) {
        case 1:
            moveTo.y -= 10;
            break;
        case 2:
            moveTo.y += 10;
            break;
        case 3:
            moveTo.x -= 10;
            break;
        case 4:
            moveTo.x += 10;
            break;
        default:
            break;
    }
    //移动函数CGAffineTransformTranslate(CGAffineTransform t,CGFloat tx, CGFloat ty);
    //参数t，表示在谁的基础上移动
    //参数tx,表示x轴的值，正数向上移动
    //参数ty,表示x轴的值，负数向下移动
    self.photoButton.transform  =  CGAffineTransformTranslate(self.photoButton.transform, moveTo.x, moveTo.y);
}

//调整大小
- (IBAction) size:(UIButton *) sender{
    //设置缩放倍数
    CGPoint  scale = {0,0};
    switch (sender.tag) {
        case 5:
            scale.x = 1.2;
            scale.y = 1.2;
            break;
        case 6:
            scale.x = 0.8;
            scale.y = 0.8;
            break;
        default:
            break;
    }
    //缩放函数CGAffineTransformScale(CGAffineTransform t,CGFloat sx, CGFloat sy)；
    //参数t，表示在谁的基础上缩放
    //参数sx,表示x轴的缩放倍数，小于1缩小
    //参数sy,表示x轴的缩放倍数，大于1放大
    self.photoButton.transform = CGAffineTransformScale(self.photoButton.transform,scale.x  ,scale.y);
}

//旋转图片
-(IBAction) rotate:(UIButton *)sender{
    //设置弧度数
    CGFloat angle = 0.25;
    if (sender.tag == 7) {
        angle = -0.25;
    }
    //旋转函数CGAffineTransformRotate(CGAffineTransform t,CGFloat angle)；
    //参数t，表示在谁的基础上旋转
    //参数angle,表示旋转的弧度数，小于0逆时针旋转，大于0顺时针旋转
    self.photoButton.transform =  CGAffineTransformRotate(self.photoButton.transform,angle);
    
}

@end

方法四：不拖控件，用代码创建控件，实现对图片的移动

#import "ViewController.h"

@interface ViewController ()
//创建私有的属性
@property (nonatomic,weak) UIButton* photoButton;

@end

@implementation ViewController

//创建按钮
-(UIButton*) buildButtonWhitX:(CGFloat) x Y:(CGFloat) y width:(CGFloat) w height:(CGFloat) h normal:(UIImage*) Image1 Highlighted:(UIImage*) Image2{
    //创建按钮
    UIButton* button = [[UIButton alloc]init];
    //把按钮加入父控件
    [self.view addSubview:button];
    //设置尺寸
    button.frame = CGRectMake(x, y, w, h);
    //设置普通状态下的背景图片
    [button setBackgroundImage:Image1 forState:UIControlStateNormal];
    //设置普通状态下的背景图片
    [button setBackgroundImage:Image2 forState:UIControlStateHighlighted];
    return button;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //创建按钮并赋值给属性photoButton
    self.photoButton = [self buildButtonWhitX:130 Y:100 width:100 height:100 normal:[UIImage imageNamed:@"btn_01"] Highlighted:[UIImage imageNamed:@"btn_02"]];
    
    //创建upButton
    UIButton* upButton = [self buildButtonWhitX:164 Y:321 width:42 height:30 normal:[UIImage imageNamed:@"top_normal"] Highlighted:[UIImage imageNamed:@"top_highlighted"]];
    //upButton按钮执行up方法
    [upButton addTarget:self action:@selector(up) forControlEvents:UIControlEventTouchUpInside];
    
    //创建downButton
    UIButton* downButton = [self buildButtonWhitX:164 Y:396 width:42 height:30 normal:[UIImage imageNamed:@"bottom_normal"] Highlighted:[UIImage imageNamed:@"bottom_highlighted"]];
    //downButton按钮执行down方法
    [downButton addTarget:self action:@selector(down) forControlEvents:UIControlEventTouchUpInside];
    
    //创建leftButton
    UIButton* leftButton = [self buildButtonWhitX:121 Y:358 width:46 height:30 normal:[UIImage imageNamed:@"left_normal"] Highlighted:[UIImage imageNamed:@"left_highlighted"]];
    //leftButton按钮执行left方法
    [leftButton addTarget:self action:@selector(left) forControlEvents:UIControlEventTouchUpInside];
    
    //创建rightButton
    UIButton* rightButton = [self buildButtonWhitX:205 Y:358 width:46 height:30 normal:[UIImage imageNamed:@"right_normal"] Highlighted:[UIImage imageNamed:@"right_highlighted"]];
    //rightButton按钮执行right方法
    [rightButton addTarget:self action:@selector(right) forControlEvents:UIControlEventTouchUpInside];
}

//调整frame
-(void)frameX:(CGFloat)x Y:(CGFloat)y height:(CGFloat)h width:(CGFloat)w {
    //取出button的frame
    CGRect frame = self.photoButton.frame;
    //调整frame
    frame.origin.x = frame.origin.x + x;
    frame.origin.y = frame.origin.y + y;
    frame.size.height = frame.size.height + h;
    frame.size.width = frame.size.width + w;
    //更新button的frame
    self.photoButton.frame = frame;
}

//向上移动
-(void)up{
    [self frameX:0 Y:-10 height:0 width:0 ];
}

//向下移动
-(void)down{
    [self frameX:0 Y:+10 height:0 width:0 ];
}

//向左移动
-(void)left{
    [self frameX:-10 Y:0 height:0 width:0];
}

//向右移动
-(void)right{
    [self frameX:+10 Y:0 height:0 width:0];
}

//缩小
-(void)small{
    [self frameX:0 Y:0 height:-10 width:-10];
}

//放大
-(void)big{
    [self frameX:0 Y:0 height:+10 width:+10];
}

@end