UIButton

    UIButton*button=[UIButtonbuttonWithType:(UIButtonTypeRoundedRect)];

    

    button.frame=CGRectMake(150, 450, 100, 50);

    

    button.backgroundColor=[UIColorredColor];

    

    [button setTitle:@"Click"forState:UIControlStateNormal];

    

    //button交互事件－点击button改变label的文字

    [button addTarget:selfaction:@selector(gaibian)forControlEvents:UIControlEventTouchUpInside];

    

    [self.viewaddSubview:button];