OS X開發：NSButton按鈕控件應用

NSButton控件用來建立功能按鈕，和UIButton相比，其樣式要豐富許多。NSButton繼承自NSControl，其使用setTarget與setAction來添加觸發方法，如下：

NSButton * btn = [[NSButton alloc]initWithFrame:CGRectMake(50, 300, 90, 25)];
[btn setTarget:self];
[btn setAction:@selector(click)];
[self.view addSubview:btn];           

NSButton類中常用屬性和方法解析如下:

//設定按鈕标題

@property (copy) NSString *title;

//設定按鈕開啟狀态的标題

@property (copy) NSString *alternateTitle;

//設定按鈕圖檔

@property (nullable, strong) NSImage *image;

//設定按鈕開啟狀态圖檔

@property (nullable, strong) NSImage *alternateImage;

//設定按鈕圖檔位置

/*

typedef NS_ENUM(NSUInteger, NSCellImagePosition) {

NSNoImage                           = 0,            //無圖檔
NSImageOnly                         = 1,            //隻有圖檔
NSImageLeft                         = 2,            //圖檔在左側
NSImageRight                        = 3,            //圖檔在右側
NSImageBelow                        = 4,            //圖檔在下側
NSImageAbove                        = 5,            //圖檔在上側
NSImageOverlaps                     = 6,            //圖檔重疊
NSImageLeading  API_AVAILABLE(macosx(10.12)) = 7,   //正方向
NSImageTrailing API_AVAILABLE(macosx(10.12)) = 8    //逆方向           

};

*/

@property NSCellImagePosition imagePosition;

//設定圖檔縮放模式

typedef NS_ENUM(NSUInteger, NSImageScaling) {

NSImageScaleProportionallyDown = 0, // 下方縮放
NSImageScaleAxesIndependently,      // 整體縮放
NSImageScaleNone,                   // 不縮放.
NSImageScaleProportionallyUpOrDown, // 上下縮放

NSScaleProportionally NS_ENUM_DEPRECATED_MAC(10_0, 10_10, "Use NSImageScaleProportionallyDown instead") = 0,
NSScaleToFit NS_ENUM_DEPRECATED_MAC(10_0, 10_10, "Use NSImageScaleAxesIndependently instead"),
NSScaleNone NS_ENUM_DEPRECATED_MAC(10_0, 10_10, "Use NSImageScaleNone instead")           

@property NSImageScaling imageScaling NS_AVAILABLE_MAC(10_5);

//圖檔是否環繞标題

@property BOOL imageHugsTitle;

//設定按鈕狀态

enum {

NSMixedState = -1,  //混合狀态
NSOffState   =  0,  //關閉狀态
NSOnState    =  1,  //開啟狀态           

@property NSInteger state;

//設定是否顯示邊框

@property (getter=isBordered) BOOL bordered;

//設定按鈕是否透明

@property (getter=isTransparent) BOOL transparent;

//設定快捷鍵

@property (copy) NSString *keyEquivalent;

//設定富文本标題

@property (copy) NSAttributedString *attributedTitle;

@property (copy) NSAttributedString *attributedAlternateTitle;

//設定邊框風格

@property NSBezelStyle bezelStyle;

//設定是否當滑鼠移動到按鈕上時顯示邊框

@property BOOL showsBorderOnlyWhileMouseInside;

//設定按鈕聲音

@property (nullable, strong) NSSound *sound;

下面是一些便捷建立按鈕的方法：

//建立标準的按鈕 包括标題和圖檔

• (instancetype)buttonWithTitle:(NSString )title image:(NSImage )image target:(nullable id)target action:(nullable SEL)action;

//建立文字按鈕

• (instancetype)buttonWithTitle:(NSString *)title target:(nullable id)target action:(nullable SEL)action;

//建立圖檔按鈕

• (instancetype)buttonWithImage:(NSImage *)image target:(nullable id)target action:(nullable SEL)action;

//建立複選框按鈕

• (instancetype)checkboxWithTitle:(NSString *)title target:(nullable id)target action:(nullable SEL)action;

//建立單選框按鈕

• (instancetype)radioButtonWithTitle:(NSString *)title target:(nullable id)target action:(nullable SEL)action;