UIImageView默认的UserInteractionEnabled是NO

一直习惯用UIImageView作为背景，但直接把按钮或者UITextField放在上面无法相应事件。如下面：

    UIImageView * commentBG = [[UIImageViewalloc]initWithFrame:CGRectMake(0,370, 320, 35)];
    commentBG.image = [[UIImageimageNamed:@"seachbg.png"]stretchableImageWithLeftCapWidth:2topCapHeight:2];

    UITextField * commentField = [[UITextFieldalloc] initWithFrame:CGRectMake(10,10,250,30)];
    commentField.borderStyle =UITextBorderStyleRoundedRect;
    commentField.placeholder =@"写评论";
    commentField.backgroundColor = [UIColorwhiteColor];
    commentField.delegate =self;
    commentField.returnKeyType =UIReturnKeyGo;
    [commentBG addSubview:commentField];
    [commentField release];
   
    [self.viewaddSubview:commentBG];
    [commentBG release];

这是因为UIImageView默认的UserInteractionEnabled是NO，修改方法可以在添加
commentBG.UserInteractionEnabled＝NO;
也可以建一个UIView，把背景放在UIView上，再把按钮或者UITextField放在UIView上面。如下面：
UIView * commentView = [[UIViewalloc] initWithFrame:CGRectMake(0,370, 320, 35)];
    UIImageView * commentBG = [[UIImageViewalloc]initWithFrame:CGRectMake(0,370, 320, 35)];
    commentBG.image = [[UIImageimageNamed:@"seachbg.png"]stretchableImageWithLeftCapWidth:2topCapHeight:2];
    [commentView addSubview:commentBG];
    [commentBG release];
   
   
    UITextField * commentField = [[UITextFieldalloc] initWithFrame:CGRectMake(10,10,250,30)];
    commentField.borderStyle =UITextBorderStyleRoundedRect;
    commentField.placeholder =@"写评论";
    commentField.backgroundColor = [UIColorwhiteColor];
    commentField.delegate =self;
    commentField.returnKeyType =UIReturnKeyGo;
   //commentField.userInteractionEnabled = YES;
    [commentView addSubview:commentField];
    [commentField release];
   
    [self.viewaddSubview:commentView];
    [commentView release];
原文地址：http://blog.csdn.net/terrylee_cold/article/details/7198229