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];