删除控件，tag默认是0.不可以删除

if (string&&![string isEqualToString:@""]) {
[array_ addObject:string];
}
label_=[[UILabel alloc]initWithFrame:self.frame];
label_.tag=[array_ count];
NSLog(@"tag=%i",label_.tag);
label_.textColor=[UIColor redColor];
label_.backgroundColor=[UIColor clearColor];
label_.textAlignment=NSTextAlignmentLeft;
label_.font=[UIFont systemFontOfSize:15];
label_.text=[array_ objectAtIndex:[array_ count]-1];

//    label_.textColor=[UIColor clearColor];
CGSize size=[label_.text sizeWithFont:[UIFont systemFontOfSize:15]];
CGRect rect=label_.frame;
rect.origin.x=(size.width-0.75)*([array_ count]-1);
rect.origin.y=5;
rect.size=size;
label_.frame=rect;
[self.view addSubview:label_];

UILabel *labelDel=(UILabel*)[self.view viewWithTag:[array_ count]];
NSLog(@"labelDel.tag=%d",labelDel.tag);
if (labelDel) {

[labelDel removeFromSuperview];
[array_ removeLastObject];

}
NSLog(@"text count=%d",[textField_.text length]);