概述

• UIButton 是执行自定义代码以响应用户交互的控件。
• UIButton 其实包含 UIImageView 和 UILabel 两个控件，UIButton 继承于 UIControl，所以有 addtarget 监听事件

属性和方法

初始化Button不用alloc init方法，使用便利构造器方法

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

UIButton的类型如下

UIButton的状态如下

设置frame

[btn setFrame:CGRectMake(100, 100, 100, 30)];

设置某一状态下的标题

[btn setTitle:@"测试" forState:(UIControlStateNormal)];

设置某一状态下的标题颜色

[btn setTitleColor:[UIColor redColor] forState:(UIControlStateNormal)];

设置某一状态下的阴影颜色

[btn setTitleShadowColor:[UIColor purpleColor] forState:UIControlStateNormal];

设置某一状态下的背景颜色

[btn setBackgroundColor:[UIColor blackColor]];

设置标题字体大小

 btn.titleLabel.font = [UIFont systemFontOfSize:30];

设置某一状态下的背景图片(背景图片显示在其标题和前景图像后面。)

[btn setBackgroundImage:[UIImage imageNamed:@"登录logo"] forState:(UIControlStateNormal)];

设置某一状态下的前景图片

[btn setImage:[UIImage imageNamed:@"验证码"] forState:(UIControlStateNormal)];

设置标题内边距

btn.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);   top, left, bottom, right;

设置图片内边距

btn.imageEdgeInsets = UIEdgeInsetsMake(0, -10, 0, 0);

设置内容内边距

btn.contentEdgeInsets = UIEdgeInsetsMake(10, -30, 10, 10);

标题的阴影改变时，按钮是否高亮显示。默认为NO

btn.reversesTitleShadowWhenHighlighted = YES;

按钮高亮的情况下，图像的颜色是否要加深一点。默认是YES

btn.adjustsImageWhenHighlighted = YES;

按钮禁用的情况下，图像的颜色是否要加深一点。默认是YES

btn.adjustsImageWhenDisabled = YES;

按下按钮是否会发光 默认是NO

btn.showsTouchWhenHighlighted = NO;

返回button 某个状态下的标题

- (nullable NSString *)titleForState:(UIControlState)state;

返回button 某个状态下的标题颜色

- (nullable UIColor *)titleColorForState:(UIControlState)state;

返回button 某个状态下的阴影标题颜色

- (nullable UIColor *)titleShadowColorForState:(UIControlState)state;

返回button 某个状态下的图片

- (nullable UIImage *)imageForState:(UIControlState)state;

返回button 某个状态下的背景图片

- (nullable UIImage *)backgroundImageForState:(UIControlState)state;

返回button 某个状态下的富文本标题

- (nullable NSAttributedString *)attributedTitleForState:(UIControlState)state NS_AVAILABLE_IOS(6_0);

获取按钮当前标题

NSString *title = btn.currentTitle;

获取按钮当前标题颜色

UIColor *color = btn.currentTitleColor;

获取按钮当前阴影标题颜色

UIColor *shandowColor = btn.currentTitleShadowColor;

获取按钮当前按钮内图像

UIImage *image = btn.currentImage;

获取按钮当前标题背景图片

UIImage *backgroundImage = btn.currentBackgroundImage;

获取按钮当前标题富文本

NSAttributedString *aString = btn.currentAttributedTitle;

指定背景边界

- (CGRect)backgroundRectForBounds:(CGRect)bounds;

指定内容边界

- (CGRect)contentRectForBounds:(CGRect)bounds;

指定标题边界

- (CGRect)titleRectForContentRect:(CGRect)contentRect;

指定图片边界

- (CGRect)imageRectForContentRect:(CGRect)contentRect;

给按钮添加点击事件

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

UIButton点击事件如下