UI基础控件UIButton

一：UI基础 Button控件

1,简单说明：UIView和UIViewController间的关系

一个应用并不一定要有UIViewController,但是为了管理界面事件（比如按钮点击事件）一般我们在创建应用时要先创建控制器，控制器拥有一个UIView属性。

UIView用来展示数据、及用户输入数据、监听事件的触发（比如按钮的touchupinside事件）

而控制可以用来处理这些事件，赋值UIView的管理。

按钮可以展示文字和图片，也就是说按钮具有这些属性。

2，按钮的三种状态

normal （默认状态）    UIControlStateNormal

highlighted（高亮状态）UIControlStateHighted

disabled (BOOL类型）   UIControlStateDisabled 失去用户交互能力

#import "ViewController.h"
#define HEADBTNX  110
#define HEADBTNY  60
#define HEADBTNWH  100

typedef enum {
    KMOVETOP = 10,
    KMOVEBOTTOM,
    KMOVELEFT,
    KMOVERIGHT
}LLKOMVE;

#define KMOVEDEALT 50

@interface ViewController ()
@property (nonatomic, weak) UIButton *headBtn; // 头部按钮
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self loadBtnView];

//    UITextField *textFied = [[UITextField alloc] initWithFrame:CGRectMake(20, 20, 40, 20)];
//    textFied.backgroundColor = [UIColor purpleColor];
//    [self.view addSubview:textFied];
//    [textFied resignFirstResponder];
}

#pragma mark - 加载界面按钮视图控件
- (void)loadBtnView
{
    //--------------------1,创建头像按钮
    UIButton *headBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    headBtn.frame = CGRectMake(HEADBTNX, HEADBTNY, HEADBTNWH, HEADBTNWH);
    // 普通状态
    [headBtn setBackgroundImage:[UIImage imageNamed:@"btn_01"] forState:UIControlStateNormal];
    [headBtn setTitle:@"点我啊" forState:UIControlStateNormal];
    [headBtn setTitleColor:[UIColor purpleColor] forState:UIControlStateNormal];
    // 高亮状态
    [headBtn setBackgroundImage:[UIImage imageNamed:@"btn_02"] forState:UIControlStateHighlighted];
    [headBtn setTitle:@"摸我啊" forState:UIControlStateHighlighted];
    [headBtn setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];

    self.headBtn = headBtn;
    [self.view addSubview:headBtn];

    // -------------------2,创建向上按钮
    UIButton *topBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    topBtn.frame = CGRectMake(60, 350, 30, 30);
    [topBtn setBackgroundImage:[UIImage imageNamed:@"top_normal"] forState:UIControlStateNormal];
    [topBtn setBackgroundImage:[UIImage imageNamed:@"top_highlighted"] forState:UIControlStateHighlighted];
    topBtn.tag = 10;
    // 添加按钮事件：
    [topBtn addTarget:self action:@selector(moveBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:topBtn];

    // -------------------3,创建向下按钮
    UIButton *bottomBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    bottomBtn.frame = CGRectMake(60, 400, 30, 30);
    [bottomBtn setBackgroundImage:[UIImage imageNamed:@"bottom_normal"] forState:UIControlStateNormal];
    [bottomBtn setBackgroundImage:[UIImage imageNamed:@"bottom_highlighted"] forState:UIControlStateHighlighted];
    bottomBtn.tag = 11;
    [bottomBtn addTarget:self action:@selector(moveBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:bottomBtn];

    // -------------------4,创建向left按钮
    UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    leftBtn.frame = CGRectMake(20, 375, 30, 30);
    [leftBtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
    [leftBtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
    leftBtn.tag = 12;
    [leftBtn addTarget:self action:@selector(moveBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:leftBtn];

    // -------------------4,创建向right按钮
    UIButton *rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    rightBtn.frame = CGRectMake(100, 375, 30, 30);
    [rightBtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
    [rightBtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
    rightBtn.tag = 13;
    [rightBtn addTarget:self action:@selector(moveBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:rightBtn];

    //  -------------------5,创建plus到按钮
    UIButton *plusBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    plusBtn.frame = CGRectMake(180, 375, 30, 30);
    [plusBtn setBackgroundImage:[UIImage imageNamed:@"plus_normal"] forState:UIControlStateNormal];
    [plusBtn setBackgroundImage:[UIImage imageNamed:@"plus_highlighted"] forState:UIControlStateHighlighted];
    plusBtn.tag = 50;
    [plusBtn addTarget:self action:@selector(scale:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:plusBtn];

    //  -------------------6,创建minus到按钮
    UIButton *minusBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    minusBtn.frame = CGRectMake(220, 375, 30, 30);
    [minusBtn setBackgroundImage:[UIImage imageNamed:@"minus_normal"] forState:UIControlStateNormal];
    [minusBtn setBackgroundImage:[UIImage imageNamed:@"minus_highlighted"] forState:UIControlStateHighlighted];
    minusBtn.tag = 51;
    [minusBtn addTarget:self action:@selector(scale:) forControlEvents:UIControlEventTouchUpInside];
    [self.view  addSubview:minusBtn];

}

#pragma mark - 按钮缩小放大事件
- (void)scale:(UIButton *)btn
{
    CGRect  tempRect = self.headBtn.bounds;
    if (btn.tag == 50) {

        tempRect.size.width += 20;
        tempRect.size.height += 20;
    }else {
        tempRect.size.width -= 20;
        tempRect.size.height -= 20;
    }
    [UIView animateWithDuration:1.0 animations:^{

        self.headBtn.bounds = tempRect;
    }];
}

#pragma mark - 按钮移动事件
- (void)moveBtn:(UIButton *)btn
{
    CGPoint tempPoint = self.headBtn.center;
    switch (btn.tag) {
        case KMOVETOP:
            tempPoint.y -= KMOVEDEALT;
            break;
        case KMOVEBOTTOM:
            tempPoint.y += KMOVEDEALT;
            break;
        case KMOVELEFT:
            tempPoint.x -= KMOVEDEALT;
            break;
        case KMOVERIGHT:
            tempPoint.x += KMOVEDEALT;
            break;
    }

    [UIView animateWithDuration:1.0 animations:^{

        self.headBtn.center = tempPoint;
    }];
}

@end

补充：

1>退出键盘的两种方式

resignFirstResponder

当叫出键盘的那个控件(第一响应者)调用这个方法时，就能退出键盘

self.view endEditing

只要调用这个方法的控件内部存在第一响应者，就能退出键盘

2> 修改对象的结构体成员

在OC中，不允许直接修改“对象”的“结构体属性”的“成员”，但是允许修改“对象”的“结构体属性”

修改结构体属性的成员方法如下：

（1）使用临时变量记录对象的结构体属性

（2） 修改临时变量的属性

（3）将临时变量重新设置给对象的结构体属性

3> frame & bounds & center

(1) frame可以修改对象的位置和尺寸

(2)bounds可以修改对象的尺寸 (以自己的左上角为0，0点）

(3) center可以修改对象的位置（ 只有x,y属性值）