delegate

来源：互联网发布：主力建仓优化指标编辑：程序博客网时间：2024/06/05 14:12

#import <UIKit/UIKit.h>// 1.声明协议@protocol MyButtonDelegate <NSObject>- (void)changeColor;@end@interface MyButton:UIView// 2.声明代理人的属性@property(nonatomic, assign)id<MyButtonDelegate>delegate;@end

#import "MyButton.h"@implementation MyButton// 3.通过touch方法,来设置代理人执行的方法- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {   [self.delegate changeColor];  }@end

#import "RootViewController.h"#import "MyButton.h"// 4.签协议@interface RootViewController ()<MyButtonDelegate>@end@interface RootViewController ()@end@implementation RootViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor yellowColor];//    // 创建一个mybutton对象    MyButton *button = [[MyButton alloc] initWithFrame:CGRectMake(100, 100, 150, 50)];    button.backgroundColor = [UIColor yellowColor];    [self.view addSubview:button];    [button release];////    // 5.设置代理人    button.delegate = self;    UIImage *image = [UIImage imageNamed:@"/Users/dllo/Desktop/UI/UI文件/UI04/UI04_delegate/UI04_delegate/岛屿0.jpg"];    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];    // 给imageView设置图片    imageView.image = image;    [self.view addSubview:imageView];    [imageView release];    imageView.layer.cornerRadius = 100;    imageView.layer.borderWidth = 1;    imageView.layer.masksToBounds = YES;    // 毛玻璃效果    UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIblurEffectStyleLight];     // iOS8.0之后出现的新效果,用来显示模糊效果    UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];    effectView.frame = CGRectMake(0, 0, imageView.frame.size.width, iamgeView.frame.size.height);    effectView.alpha = 0.5;    // 添加子视图    [imageView addSubview:effectView];}// 6.实现协议方法- (void)changeColor {  // 设置随机的背景颜色  self.view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 / 255.0 green:arc4random() % 256 / 255.0 blue:arc4random() % 256 / 255.0 alpha:1];  }

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