IOS UI 手写 UIImageView

@implementation MainViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.            //UIImaageView 初始化方法         UIImageView *Banner = [[UIImageView alloc]init];    Banner.image = [UIImage imageNamed:@"banner.jpg"];        //UIImaageView 属性--------------------------------------------------------------------------------------    //UIImaageView 圆角属性    Banner.layer.masksToBounds = YES;    Banner.layer.cornerRadius = 10;    //UIImaageView 设置边框色和大小    Banner.layer.borderColor = [UIColor redColor].CGColor;    Banner.layer.borderWidth = 2;    //UIImaageView 设置显示或隐藏    Banner.hidden = NO;    //UIImaageView 设置图片透明度 alpha    Banner.alpha = 1;        Banner.tag = 100;        //UIViewContentModeScaleToFill      拉伸自适应比例    //UIViewContentModeScaleAspectFit   不拉伸自适应比例    //UIViewContentModeBottom           填充底部    //UIViewContentModeRedraw           尺寸改变时重绘    //UIViewContentModeCenter           填充中间    //UIViewContentModeTop              填充顶部    //UIViewContentModeLeft             中间贴左    //UIViewContentModeRight            中间贴右    //UIViewContentModeTopLeft          贴左上    //UIViewContentModeTopRight         贴右上    //UIViewContentModeBottomLeft       贴左下    //UIViewContentModeBottomRight      贴右下            Banner.contentMode = UIViewContentModeScaleToFill;    //Banner.contentMode = UIViewContentModeScaleAspectFit;    //Banner.contentMode = UIViewContentModeBottom;    //Banner.contentMode = UIViewContentModeRedraw;    //Banner.contentMode = UIViewContentModeCenter;    //Banner.contentMode = UIViewContentModeTop;    //Banner.contentMode = UIViewContentModeLeft;    //Banner.contentMode = UIViewContentModeRight;    //Banner.contentMode = UIViewContentModeTopLeft;    //Banner.contentMode = UIViewContentModeTopRight;    //Banner.contentMode = UIViewContentModeBottomLeft;    //Banner.contentMode = UIViewContentModeBottomRight;                // imageview 的用户交互    Banner.userInteractionEnabled = YES;        // 创建单击手势  初始化    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(haha:)];        //控件添加手势    [Banner addGestureRecognizer:tap];        // 设置 高亮状态 图片    Banner.highlightedImage = [UIImage imageNamed:@"2.jpg"];        //给初始化完的UIImaageView定位置和宽高    Banner.frame = CGRectMake(20, 70, 100, 80);    //添加按钮进屏幕     [self.view addSubview:Banner];        }// 手势的自定义方法- (void)haha:(UITapGestureRecognizer *)tt{    // 通过tag值 找到对应的控件 （上面的创建的 imageview   Banner）    UIImageView *ss = (UIImageView *)[self.view viewWithTag:100];     // 设置显示 高亮状态    ss.highlighted = YES;}