专门用来处理用户的点击交互事件的
1.创建UIButton组件
UIButton * btn = [[UIButton alloc] init];
2.建立父子关系
[self.window addSubview:btn];
3.设置正确的Frame值
btn.frame = CGRectMake(0, 100, 176, 80);
btn.backgroundColor = [UIColor redColor];
UIControlState一个按钮,都有3种常用的状态
1.自然(默认)状态 UIControlStateNormal
2.高亮状态 UIControlStateHighlighted
3.选中状态 UIControlStateSelected
设置默认状态下显示的文字
[btn setTitle:@"请点击我" forState:UIControlStateNormal];
设置高亮状态下显示文字的内容
[btn setTitle:@"点了" forState:UIControlStateHighlighted];
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UIImage 对象是专门用来加载程序中图片的对象
设置默认状态下显示的背景图片
UIImage * normalImage = [UIImage imageNamed:@"btn_normal"];
[btn setBackgroundImage:normalImage forState:UIControlStateNormal];
设置高亮状态下显示的背景图片
UIImage * highlightedImage = [UIImage imageNamed:@"btn_press"];
[btn setBackgroundImage:highlightedImage forState:UIControlStateHighlighted];
设置不同状态下文字显示的具体颜色
[btn setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
[btn setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];
设置文字大小
btn.titleLabel.font = [UIFont systemFontOfSize:30];
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UIButtonTypeInfoLight 系统提供的一些基本样式
UIButtonTypeCustom 自定UIButton对象
1.创建
UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
2.建立父子关系
[self.window addSubview:btn];
3.设置正确的Frame值
btn.frame = CGRectMake(100, 100, 150, 100);
4.设置提示小图标
默认状态下,是小图标在左边,文字显示在右边
[btn setImage:[UIImage imageNamed:@"test"] forState:UIControlStateNormal];
[btn setTitle:@"礼物" forState:UIControlStateNormal];
设置内容边距
// CGFloat top, left, bottom, right;
//整体调整UIButton显示内容的边距
// btn.contentEdgeInsets = UIEdgeInsetsMake(-10, -50, 0, 0);
局部调整内容的边距
1. 调整提示图片的边距
btn.imageEdgeInsets = UIEdgeInsetsMake(-50, 0, 0, 0);
2.设置文字的边距
btn.titleEdgeInsets = UIEdgeInsetsMake(0, -100, -50, 0);
btn.backgroundColor = [UIColor redColor];
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4.添加监听事件
UIButton 可以相应用户的基本事件
1.点击 UIControlEventTouchUpInside 是最为常用的,几乎每天都要用到
2.拖拽等操作
[btn1 addTarget:self action:@selector(btn1Touch:) forControlEvents:UIControlEventTouchUpInside];
专门用来做临时标记的值,方便我们用来去分,不同的组件
btn1.tag = 1;
UIButton * btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
[self.window addSubview:btn2];
btn2.frame = CGRectMake(100, 200, 100, 50);
btn2.backgroundColor = [UIColor redColor];
[btn2 addTarget:self action:@selector(btn1Touch:) forControlEvents:UIControlEventTouchUpInside];
btn2.tag = 2;
- (void)btn1Touch:(UIButton *)sender
{
通过tag值,来区分不同的按钮激发当前逻辑
NSInteger tag = sender.tag;
if(tag == 1)
{
NSLog(@"d点击了黄色按钮");
}
else if (tag == 2)
{
NSLog(@"点击了红色按钮");
}
}
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
btn.contentEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
btn.titleEdgeInsets = UIEdgeInsetsMake(0, 20, 0, 0);
//设置图片内容始终居中显示
btn.imageView.contentMode = UIViewContentModeCenter;
//设置图片内容，如果超出了容器的bounds（边缘）是否裁剪掉
btn.imageView.clipsToBounds = NO;