iOS——UIButton

一、概述

1. 說明 

UIButton 繼承 UIControl（基本控件類）

2. 屬性

1）創建 UIButton 對象並使用指定的風格

+ (instancetype)buttonWithType:(UIButtonType)buttonType;

UIButtonType 枚舉如下 :

typedef NS_ENUM(NSInteger, UIButtonType) {
        UIButtonTypeCustom = 0,                         // 無風格，創建帶圖片的按鈕需要這種風格
        UIButtonTypeSystem,                             // 系統風格
        UIButtonTypeDetailDisclosure,                   // 顯示詳細按鈕
        UIButtonTypeInfoLight,                          // 亮色感嘆號按鈕
        UIButtonTypeInfoDark,                           // 暗色感嘆號按鈕
        UIButtonTypeContactAdd,                         // 加號按鈕
        UIButtonTypeRoundedRect = UIButtonTypeSystem,   // 圓角按鈕，被廢棄，使用 UIButtonTypeSystem 代替
    };

2）保存 UIButton 對象的風格

@property(nonatomic,readonly)UIButtonType buttonType;

3）獲取按鈕的標題label(在按鈕上有一個label)

@property(nullable,nonatomic,readonly,strong)UILabel * titleLabel;

4）獲取按鈕的圖片視圖

@property(nullable,nonatomic,readonly,strong)UIImageView *imageView;

5）設置按鈕的 標題label 的標題和狀態

- (void)setTitle:(nullableNSString *)title forState:(UIControlState)state; 

UIControlState 枚舉如下 :

typedef NS_OPTIONS(NSUInteger, UIControlState) {
        UIControlStateNormal       = 0,          // 正常狀態
        UIControlStateHighlighted  = 1 << 0,     // 按下狀態（當按下按鈕時）
        UIControlStateDisabled     = 1 << 1,     // 禁用狀態（無法響應事件，可以通過 enable 屬性設置爲 NO 也是此狀態）
        UIControlStateSelected     = 1 << 2,     // 選中狀態（可以響應事件，可以通過 selected 屬性設置爲 YES 也是此狀態）
        UIControlStateFocused      = 1 << 3,     // 聚焦狀態，iOS9纔有
        UIControlStateApplication  = 0x00FF0000, // 當用作應用標誌時
        UIControlStateReserved     = 0xFF000000  //內部框架預留，無意義
    };

6）設置按鈕的 標題label 的顏色和狀態

- (void)setTitleColor:(nullableUIColor *)color forState:(UIControlState)state;

7）設置按鈕的 標題label 的引用顏色和狀態

- (void)setTitleShadowColor:(nullableUIColor *)color forState:(UIControlState)state ;

8）設置按鈕的 圖片和狀態

- (void)setImage:(nullableUIImage *)image forState:(UIControlState)state; 

9）設置背景圖片和狀態

- (void)setBackgroundImage:(nullableUIImage *)image forState:(UIControlState)state;

10)設置屬性標題和狀態

- (void)setAttributedTitle:(nullableNSAttributedString *)title forState:(UIControlState)state;

11）返回指定狀態的標題

- (nullableNSString *)titleForState:(UIControlState)state;

12）返回指定狀態的標題顏色

- (nullableUIColor *)titleColorForState:(UIControlState)state;

13）返回指定狀態的標題陰影顏色

- (nullableUIColor *)titleShadowColorForState:(UIControlState)state;

14）返回指定狀態的圖片

- (nullableUIImage *)imageForState:(UIControlState)state;

15）返回指定狀態的背景圖片

- (nullableUIImage *)backgroundImageForState:(UIControlState)state;

16）返回指定狀態的屬性字符串

- (nullableNSAttributedString *)attributedTitleForState:(UIControlState)state;

17）返回當前狀態的標題

@property(nullable,nonatomic,readonly,strong)NSString *currentTitle;

17）返回當前狀態的標題顏色

@property(nonatomic,readonly,strong)UIColor  *currentTitleColor;

19）返回當前狀態的標題陰影顏色

@property(nullable,nonatomic,readonly,strong)UIColor  *currentTitleShadowColor;

20）返回當前狀態的圖片

@property(nullable,nonatomic,readonly,strong)UIImage  *currentImage;

21）返回當前狀態的背景圖片

@property(nullable,nonatomic,readonly,strong)UIImage  *currentBackgroundImage;

22）返回當前狀態的屬性字符串

@property(nullable,nonatomic,readonly,strong)NSAttributedString *currentAttributedTitle;