btn.frame = CGRectMake(x, y, width, height);
[btn setTitle: @"search" forState: UIControlStateNormal];
//设置按钮上的自体的大小
//[btn setFont: [UIFont systemFontSize: 14.0]]; //这种可以用来设置字体的大小，但是可能会在将来的SDK版本中去除改方法
//应该使用
btn.titleLabel.font = [UIFont systemFontOfSize: 14.0];
[btn seBackgroundColor: [UIColor blueColor]];
//最后将按钮加入到指定视图superView
[superView addSubview: btn];

tvnamelabel=[[UIButton alloc]initWithFrame:CGRectMake(5,5,200,40)];

btn.contentHorizontalAlignment=UIControlContentHorizontalAlignmentLeft ;//设置文字位置，现设为居左，默认的是居中
[btn setTitle:@“title”forState:UIControlStateNormal];// 添加文字

btn.textLabel.textAlignment = UITextAlignmentLeft

btn.contentHorizontalAlignment = UIControlContentHorizonAlignmentLeft;

btn.contentEdgeInsets = UIEdgeInsetsMake(0,10, 0, 0);

[btn.titleLabel setTextColor:[UIColorblackColor]];
btn.titleLabel.textColor=[UIColor redColor];

[btn setTitleColor:[UIColor blackColor]forState:UIControlStateNormal];