UIButton

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

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

button.backgroundColor=[UIColor
redColor];

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

//button交互事件－点击button改变label的文字

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

[self.view
addSubview:button];