OS X 有一个特有的控件叫做 IKPictureTaker，允许用户从计算机上选择一张图片，或者从摄像头捕捉一张图片。当用户选择了图片之后，这个控件会调用指定的代理方法。

系统图片选取

摄像头选取

实现效果图

1.API

-(void) beginPictureTakerSheetForWindow:(NSWindow *)aWindow withDelegate:(id) delegate didEndSelector:(SEL) didEndSelector contextInfo:(void *) contextInfo; 

2.import

#import <Quartz/Quartz.h>

3.实现代码

[[IKPictureTaker pictureTaker] beginPictureTakerSheetForWindow:[NSApplication sharedApplication].keyWindow withDelegate:self didEndSelector:@selector(pictureTakerDidEnd:returnCode:contextInfo:) contextInfo:nil];

4.代理方法

- (void)pictureTakerDidEnd:(IKPictureTaker *)picker returnCode:(NSInteger)code contextInfo:(void*)contextInfo{
    NSImage * image = [picker outputImage];
    if (image) {
        self.imageView.image = image;
    }
    NSLog(@"NSImage:%@",image);
    NSLog(@"code:%ld",code);
}