UIButton基本使用方法

//创建

UIButton *left = [UIButtonbuttonWithType:UIButtonTypeCustom];

//设置文字

[left setTitle:@"left"forState: UIControlStateNormal];

//设置文体大小

left.titleLabel.font = [UIFontsystemFontOfSize:25.0];

//设置文字颜色

[left setTitleColor:[UIColorblackColor]forState:UIControlStateNormal];

//设置背景色

left.backgroundColor =UIColorFromRGB(0xf3f333);

left.contentMode =UIViewContentModeTopRight;

//设置矩形四个圆角半径

[left.layersetCornerRadius:10.0];

//设置处理函数

[left addTarget:selfaction:@selector(leftButtonPressed:)forControlEvents:UIControlEventTouchDown];

left.frame =CGRectMake(0,400,100, 50);

//设置背景图

[left setImage:[UIImageimageNamed:@"blue_bg(2).png"] forState:UIControlStateNormal];

[leftsetAlpha:0.5];//设置透明度

//设置左对齐

songBtn.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;

//设置底部对齐

songBtn.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;