ios开发——手势识别（Long Press）

#import "ViewController.h"

@interface ViewController (){
    //设置垃圾桶是否为空变量，NO为满，YES为空
    BOOL boolTrashEmptyFlag;
}
//定义两张图和它们容器的属性
@property (strong,nonatomic) UIImage *imageTrashFull;
@property (strong,nonatomic) UIImage *imageTrashEmpty;
@property (strong,nonatomic) UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    //界面设置
    CGRect screen = [[UIScreen mainScreen] bounds];
    CGFloat imageViewWidth = 128;
    CGFloat imageViewHeight = 128;
    CGFloat imageViewTopView = 148;
    CGRect frame = CGRectMake((screen.size.width - imageViewWidth)/2 , imageViewTopView, imageViewWidth, imageViewHeight);
    self.imageView = [[UIImageView alloc] initWithFrame:frame];
    self.imageTrashFull = [UIImage imageNamed:@"Blend Trash Full.png"];
    self.imageTrashEmpty = [UIImage imageNamed:@"Blend Trash Empty"];
    self.imageView.image = self.imageTrashFull;
    [self.view addSubview:self.imageView];
    
    
    
    //新建手势识别器
    UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(foundLongPress:)];
    //设置手势识别器的属性1允许移动位置2最小长按时间
    recognizer.allowableMovement = 100.0f;
    recognizer.minimumPressDuration = 1.0;
    //将手势识别器关联到imageView
    [self.imageView addGestureRecognizer:recognizer];
    //将imageView开启用户事件
    self.imageView.userInteractionEnabled = YES;
}


-(void)foundLongPress:(UIGestureRecognizer*)sender{
    if (sender.state == UIGestureRecognizerStateBegan) {
        if (boolTrashEmptyFlag) {
            self.imageView.image = self.imageTrashFull;
            boolTrashEmptyFlag = NO;
        }else{
            self.imageView.image = self.imageTrashEmpty;
            boolTrashEmptyFlag = YES;
        }
        
    }
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}


@end