macOS开发之鼠标箭头样式

我们再开发macOS客户端的时候会有修改鼠标箭头样式的需求，我们今天就解决问题，就是这个类NSCursor，代码量比较少，直接上代码

核心思路：给当前类添加鼠标监听，然后修改鼠标样式

#import "SHButton.h"

@interface SHButton ()
@property (nonatomic , strong) NSTrackingArea *trackingArea;
@end
@implementation SHButton
-(void)updateTrackingAreas{
    if (self.trackingAreas.count > 0) {
        [self removeTrackingArea:_trackingArea];
    }
    NSTrackingAreaOptions options = NSTrackingMouseEnteredAndExited|NSTrackingActiveInKeyWindow;
    _trackingArea = [[NSTrackingArea alloc] initWithRect:self.bounds
                                                                options:options
                                                                  owner:self
                                                               userInfo:nil];
    [self addTrackingArea:_trackingArea];
}

-(void)mouseEntered:(NSEvent *)theEvent{
    [[NSCursor pointingHandCursor] set];
}

-(void)mouseExited:(NSEvent *)theEvent{
    [[NSCursor arrowCursor] set];
}
@end

• updateTrackingAreas这个方法类似于我们iOS的layoutSubviews调用频繁，所以需要清除之前的监听
• 下面的两个回调方法就不多解释了，是鼠标监听回调
• [[NSCursor pointingHandCursor] set]这里是修改鼠标样式的代码
• 鼠标的其它样式如下：

@property (class, readonly, strong) NSCursor *arrowCursor;
@property (class, readonly, strong) NSCursor *IBeamCursor;
@property (class, readonly, strong) NSCursor *pointingHandCursor;
@property (class, readonly, strong) NSCursor *closedHandCursor;
@property (class, readonly, strong) NSCursor *openHandCursor;
@property (class, readonly, strong) NSCursor *resizeLeftCursor;
@property (class, readonly, strong) NSCursor *resizeRightCursor;
@property (class, readonly, strong) NSCursor *resizeLeftRightCursor;
@property (class, readonly, strong) NSCursor *resizeUpCursor;
@property (class, readonly, strong) NSCursor *resizeDownCursor;
@property (class, readonly, strong) NSCursor *resizeUpDownCursor;
@property (class, readonly, strong) NSCursor *crosshairCursor;
@property (class, readonly, strong) NSCursor *disappearingItemCursor;
@property (class, readonly, strong) NSCursor *operationNotAllowedCursor API_AVAILABLE(macos(10.5));
@property (class, readonly, strong) NSCursor *dragLinkCursor API_AVAILABLE(macos(10.6));
@property (class, readonly, strong) NSCursor *dragCopyCursor API_AVAILABLE(macos(10.6));
@property (class, readonly, strong) NSCursor *contextualMenuCursor API_AVAILABLE(macos(10.6));
@property (class, readonly, strong) NSCursor *IBeamCursorForVerticalLayout API_AVAILABLE(macos(10.7));

NSCursor这个类还有其它的一些方法，这里就不罗列了，有感兴趣的小伙伴可以自行查阅