前言
本來沒有打算寫這篇文章的, 主要是因為在工作中遇到一些同事再用 有UIButton的時候, 有些很基本的,系統API提供的都不知道, 例如 如何讓UIButton的文字居上,居左, 居右, 居下對其等一些基本點, 為此我特地寫了一下UIButton小結
UIButton回顧
繼承關系
NSObject -> UIResponder -> UIView -> UIControl -> UIButton
API
初始化
遍歷構造器
+ (instancetype)buttonWithType:(UIButtonType)buttonType;
button類型
typedef NS_ENUM(NSInteger, UIButtonType) {
UIButtonTypeCustom = 0, //自定義風格
UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), //系統樣式,從iOS7開始使用
UIButtonTypeDetailDisclosure, //藍色小箭頭按鈕,主要做詳細說明用
UIButtonTypeInfoLight, //亮色感嘆號
UIButtonTypeInfoDark, //暗色感嘆號
UIButtonTypeContactAdd, //十字加號按鈕
UIButtonTypeRoundedRect = UIButtonTypeSystem, //圓角矩形,從iOS7廢棄,iOS6中可以使用
};
偏移量
內容偏移量:正值表示間隔值,負值表示超出參照物的距離。UIEdgeInsetsMake(top, left, bottom, right)
有四個值需要設置,分別距離上左下右邊的間隔。
// default is UIEdgeInsetsZero. On tvOS 10 or later, default is nonzero except for custom buttons.
@property(nonatomic) UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR;
標題偏移量:和圖片偏移量是相對的,比如:自定義一個按鈕實現的效果是圖片在左邊,標題在右邊,可以用這個屬性,設置完標題偏移量,圖片偏移量就是相對于標題的
@property(nonatomic) UIEdgeInsets titleEdgeInsets; // default is UIEdgeInsetsZero
圖片偏移量
@property(nonatomic) UIEdgeInsets imageEdgeInsets;
其他API
button的狀態為高亮時,文本的陰影會反轉 默認是NO
@property(nonatomic) BOOL reversesTitleShadowWhenHighlighted;
button的狀態為高亮時,圖像變暗 默認是YES
@property(nonatomic) BOOL adjustsImageWhenHighlighted;
button的狀態為禁用時,圖像變暗。默認是YES
@property(nonatomic) BOOL adjustsImageWhenDisabled;
button的狀態為高亮時,發光。默認是NO
@property(nonatomic) BOOL showsTouchWhenHighlighted;
系統的一些樣式DetailDisclosure
InfoLight
InfoDark
ContactAdd
顏色會改變
@property(nonatomic,retain) UIColor *tintColor NS_AVAILABLE_IOS(5_0);
button的狀態。包括一些其他的控制的狀態
typedef NS_OPTIONS(NSUInteger, UIControlState) {
UIControlStateNormal = 0, //正常狀態
UIControlStateHighlighted = 1 << 0, //高亮狀態
UIControlStateDisabled = 1 << 1, //禁用狀態
UIControlStateSelected = 1 << 2, //選中狀態
UIControlStateApplication = 0x00FF0000,
UIControlStateReserved = 0xFF000000
};
// 設置標題 default is nil. title is assumed to be single line
- (void)setTitle:(nullable NSString *)title forState:(UIControlState)state;
// 設置標題顏色 default if nil. use opaque white
- (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR;
// 設置標題陰影顏色default is nil. use 50% black
- (void)setTitleShadowColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR;
// 設置圖片default is nil.
should be same size if different for different states
- (void)setImage:(nullable UIImage *)image forState:(UIControlState)state;
// 設置背景圖片// default is nil
- (void)setBackgroundImage:(nullable UIImage *)image forState:(UIControlState)state UI_APPEARANCE_SELECTOR;
// 設置富文本標題default is nil. title is assumed to be single line
- (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(UIControlState)state NS_AVAILABLE_IOS(6_0);
// 返回不同狀態下標題
- (nullable NSString *)titleForState:(UIControlState)state;
// 返回不同狀態下標題顏色
- (nullable UIColor *)titleColorForState:(UIControlState)state;
// 返回不同狀態下標題陰影顏色
- (nullable UIColor *)titleShadowColorForState:(UIControlState)state;
// 返回不同狀態下圖片
- (nullable UIImage *)imageForState:(UIControlState)state;
// 返回不同狀態下背景圖片
- (nullable UIImage *)backgroundImageForState:(UIControlState)state;
// 返回不同狀態下富文本標題
- (nullable NSAttributedString *)attributedTitleForState:(UIControlState)state NS_AVAILABLE_IOS(6_0);
// button的當前標題。當按鈕狀態改變時值自動改變,可以做判斷,當前標題是全文則點擊展開標題設置為收起,當前標題是收起則點擊收起全文。
@property(nullable, nonatomic,readonly,strong) NSString *currentTitle;
// 當前標題顏色default is white(1,1)
@property(nonatomic,readonly,strong) UIColor *currentTitleColor;
// 當前狀態下標題陰影顏色
@property(nullable, nonatomic,readonly,strong) UIColor *currentTitleShadowColor;
// 當前狀態下圖片 切換不同圖片,比如做單選,多選可以使用。
@property(nullable, nonatomic,readonly,strong) UIImage *currentImage;
@property(nullable, nonatomic,readonly,strong) UIImage *currentBackgroundImage;
@property(nullable, nonatomic,readonly,strong) NSAttributedString *currentAttributedTitle NS_AVAILABLE_IOS(6_0);
@property(nullable, nonatomic,readonly,strong) UILabel *titleLabel NS_AVAILABLE_IOS(3_0);
@property(nullable, nonatomic,readonly,strong) UIImageView *imageView NS_AVAILABLE_IOS(3_0);
// 返回背景繪制區域
- (CGRect)backgroundRectForBounds:(CGRect)bounds;
// 返回內容繪制區域。內容區域是顯示圖片和標題及他們特定對齊縮放等的范圍
- (CGRect)contentRectForBounds:(CGRect)bounds;
// 返回標題的繪制區域
- (CGRect)titleRectForContentRect:(CGRect)contentRect;
// 返回圖片的繪制區域
- (CGRect)imageRectForContentRect:(CGRect)contentRect;
這個地方的API是UIControl的, 很多人并沒有在意這個類, 然后用一些很笨的手段去解決對其方式
// button 內容垂直對其方式 default is center
@property(nonatomic) UIControlContentVerticalAlignment contentVerticalAlignment;
// button 內容水平對其方式 default is center
@property(nonatomic) UIControlContentHorizontalAlignment contentHorizontalAlignment;