前言：UI控件整理之UIButton
一、显示图片（复选框）
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake([UIScreen mainScreen].bounds.size.width/2 - 15, 60, 30, 30);
[button setImage:[UIImage imageNamed:@"icon_weixuanzhong-1"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"icon_xuanzhong-1"] forState:UIControlStateSelected];
[button setBackgroundColor:[UIColor whiteColor]];
[button addTarget:self action:@selector(didChangeBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
二、显示文字
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(30, 60, [UIScreen mainScreen].bounds.size.width - 60, 30);
[button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[button setTitle:@"UIButton" forState:UIControlStateNormal];
button.titleLabel.font = [UIFont fontWithName:@"IowanOldStyle-Bold" size:15];
[button setBackgroundColor:[UIColor whiteColor]];
[button addTarget:self action:@selector(didChangeBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
三、部分常用属性解析
1、初始化Button（枚举值）
//初始化Button 不用alloca init 的方法 用便利构造器初始化
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
UIButtonTypeCustom // -自定义风格
UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0),
UIButtonTypeDetailDisclosure //蓝色小箭头按钮，主要做详细说明
UIButtonTypeInfoLight //-亮色感叹号
UIButtonTypeInfoDark //-暗色感叹号
UIButtonTypeContactAdd // -十字加号按钮
UIButtonTypeRoundedRect = UIButtonTypeSystem //-圆角矩形
2、//设置button的背景图片
[button setBackgroundImage:[UIImage imageNamed:@"bg.png"] forState:UIControlStateNormal];
3、//设置前景图片 前景图片必须是镂空图，或者是线条勾勒的图片
[button setImage:[UIImage imageNamed:@"qj.png"] forState:UIControlStateNormal];
4、状态（forState）
/* forState: 这个参数的作用是定义按钮的文字或图片在何种状态下才会显现*/
UIControlStateNormal = 0 // 常规状态显现
UIControlStateHighlighted = 1 << 0 // 高亮状态显现
UIControlStateDisabled = 1 << 1 // 禁用的状态才会显现
UIControlStateSelected = 1 << 2 // 选中状态
UIControlStateApplication = 0x00FF0000 //当应用程序标志时
UIControlStateReserved = 0xFF000000 //为内部框架预留，可以不管他
5、获取按钮当前标题
@property(nullable, nonatomic,readonly,strong) NSString *currentTitle;
6、获取按钮当前按钮内图像
@property(nullable, nonatomic,readonly,strong) UIImage *currentImage;
7、按钮点击事件（枚举值）
UIControlEventTouchDown // 单点触摸按下事件：用户点触屏幕，或者又有新手指落下的时候。
UIControlEventTouchDownRepeat // 多点触摸按下事件，点触计数大于1：用户按下第二、三、或第四根手指的时候。
UIControlEventTouchDragInside // 当一次触摸在控件窗口内拖动时。
UIControlEventTouchDragOutside // 当一次触摸在控件窗口之外拖动时。
UIControlEventTouchDragEnter // 当一次触摸从控件窗口之外拖动到内部时
UIControlEventTouchDragExit // 当一次触摸从控件窗口内部拖动到外部时。
UIControlEventTouchUpInside // 所有在控件之内触摸抬起事件
UIControlEventTouchUpOutside // 所有在控件之外触摸抬起事件(点触必须开始与控件内部才会发送通知)。
UIControlEventTouchCancel // 所有触摸取消事件，即一次触摸因为放上了太多手指而被取消，或者被上锁或者电话呼叫打断。
UIControlEventValueChanged // 当控件的值发生改变时，发送通知。用于滑块、分段控件、以及其他取值的控件。你可以配置滑块控件何时发送通知，在滑块被放下时发送，或者在被拖动时发送。
UIControlEventEditingDidBegin // 当文本控件中开始编辑时发送通知
UIControlEventEditingChanged // 当文本控件中的文本被改变时发送通知。
UIControlEventEditingDidEnd // 当文本控件中编辑结束时发送通知。
UIControlEventEditingDidEndOnExit // 当文本控件内通过按下回车键（或等价行为）结束编辑时，发送通知。
UIControlEventAllTouchEvents // 通知所有触摸事件。
UIControlEventAllEditingEvents // 通知所有关于文本编辑的事件。
UIControlEventApplicationReserved // range available for application use
UIControlEventSystemReserved // range reserved for internal framework use
UIControlEventAllEvents // 通知所有事件
8、标题内距离
@property(nonatomic) UIEdgeInsets titleEdgeInsets;
9、图片内边距
@property(nonatomic) UIEdgeInsets imageEdgeInsets;
四、常用拓展（系统属性排列）
@property(nonatomic) UIEdgeInsets contentEdgeInsets; 内容内距离
@property(nonatomic) UIEdgeInsets titleEdgeInsets; 标题内距离
@property(nonatomic) BOOL reversesTitleShadowWhenHighlighted; 标题的阴影改变时，按钮是否高亮显示。默认为NO
@property(nonatomic) UIEdgeInsets imageEdgeInsets; 图片内边距
@property(nonatomic) BOOL adjustsImageWhenHighlighted;按钮高亮的情况下，图像的颜色是否要加深一点。默认是YES
@property(nonatomic) BOOL adjustsImageWhenDisabled; 按钮禁用的情况下，图像的颜色是否要加深一点。默认是YES
@property(nonatomic) BOOL showsTouchWhenHighlighted; 按下按钮是否会发光 默认是NO
@property(nonatomic,readonly) UIButtonType buttonType; button的类型
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;
示例：
- (CGRect)imageRectForContentRect:(CGRect)bounds{
return CGRectMake(0.0, 0.0, 44, 44);
}
获取按钮当前标题
@property(nullable, nonatomic,readonly,strong) NSString *currentTitle;
获取按钮当前标题颜色
@property(nonatomic,readonly,strong) UIColor *currentTitleColor;
获取按钮当前阴影标题颜色
@property(nullable, nonatomic,readonly,strong) UIColor *currentTitleShadowColor;
获取按钮当前按钮内图像
@property(nullable, nonatomic,readonly,strong) UIImage *currentImage;
获取按钮当前标题背景图片
@property(nullable, nonatomic,readonly,strong) UIImage *currentBackgroundImage;
获取按钮当前标题富文本
@property(nullable, nonatomic,readonly,strong) NSAttributedString *currentAttributedTitle
@property(nullable, nonatomic,readonly,strong) UILabel *titleLabel NS_AVAILABLE_IOS(3_0);
@property(nullable, nonatomic,readonly,strong) UIImageView *imageView NS_AVAILABLE_IOS(3_0);
设置button某个状态的标题
- (void)setTitle:(nullable NSString *)title forState:(UIControlState)state;
例： [button setTitle:@"开灯" forState:UIControlStateNormal];
设置button某个状态的标题颜色
- (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)state
例：[button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
设置button某个状态阴影的标题颜色
- (void)setTitleShadowColor:(nullable UIColor *)color forState:(UIControlState)state
例：[button setTitleShadowColor:[UIColor purpleColor] forState:UIControlStateNormal];
设置button某个状态图片
- (void)setImage:(nullable UIImage *)image forState:(UIControlState)state;
设置button 某个状态背景图片
- (void)setBackgroundImage:(nullable UIImage *)image forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // default is nil
设置button 某个状态下的富文本标题
- (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(UIControlState)state NS_AVAILABLE_IOS(6_0); // default is nil. title is assumed to be single line
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);
