iOS移动应用开发零碎细节随笔

浏览数：26 / 时间：2015年06月11日

1.关于视图交互的屏蔽问题

（1）下文代码段表现的视图层次关系是self.view上放置_launchScrollView，而_launchScrollView 上放置了4个launchImageView用来当欢迎界面做应用首次使用介绍，再者最后1个launchImageView中间放置comeinBtn。

（2）现欲comeinBtnClick事件触发，且在默认情况下发现并不可行（userInteractionEnabled 默认为NO）

（3）分析：交互默认为NO,会屏蔽掉launchImageView内子视图所有点击事件和手势,所以必须要打开

 1 - (void)viewDidLoad
 2 {
 3     [super viewDidLoad];
 4     // Do any additional setup after loading the view.
 5     
 6     NSInteger imageCount = 4;
 7     _launchScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0.0, 0.0, HBScreenWidth, HBScreenHeight)];
 8     _launchScrollView.bounces = NO;
 9     _launchScrollView.pagingEnabled = YES;
10     _launchScrollView.showsHorizontalScrollIndicator = NO;
11     _launchScrollView.contentOffset = CGPointMake(0.0, 0.0);
12     _launchScrollView.contentSize = CGSizeMake(HBScreenWidth * imageCount, 0);
13     
14     //导入图片
15     for (NSInteger i = 0; i < imageCount; i++) {
16         UIImageView *launchImageView = [[UIImageView alloc]initWithFrame:CGRectMake(HBScreenWidth * i, 0.0, HBScreenWidth, HBScreenHeight)];
17         UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"start_h%d", i + 1]];
18         image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0) resizingMode:UIImageResizingModeStretch];
19         launchImageView.image = image;
20         
21         //此处交互默认为NO,会屏蔽掉launchImageView内子视图所有点击事件和手势,所以必须要打开
22         launchImageView.userInteractionEnabled = YES;
23         
24         if (i == 3) {
25             UIButton *comeinBtn = [UIButton buttonWithType:UIButtonTypeCustom];
26             comeinBtn.frame = CGRectMake(HBScreenWidth * 0.42, HBScreenHeight * 0.6 , HBScreenWidth * 0.17, HBScreenHeight * 0.08);
27             comeinBtn.backgroundColor = [UIColor colorWithRed:197/255.0 green:233/255.0 blue:250/255.0 alpha:1.0];
28             comeinBtn.layer.borderWidth = 1.0;
29             comeinBtn.titleLabel.font = [UIFont fontWithName:nil size:15.0];
30             [comeinBtn setTitle:@"点击进入" forState:UIControlStateNormal];
31             [comeinBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
32             [comeinBtn addTarget:self action:@selector(comeinBtnClick) forControlEvents:UIControlEventTouchUpInside];
33             [launchImageView addSubview:comeinBtn];
34         }
35         [_launchScrollView addSubview:launchImageView];
36     }
37     [self.view addSubview:_launchScrollView];
38 }