默认图形

Question

是否可以找到UIBarButtonSystemItem的默认图形作为物理图像文件？

Answer 1

我不知道如何从sdk中取出图像，但你可以通过iphone模拟器将它们打印到磁盘上。只需将您想要的任何UIBarButtonSystemItem添加到导航栏并将其操作指向printImages

- (void)printImages {
  UIView *navbar = (UIView *)self.navigationController.navigationBar;
  for (UIView *v in navbar.subviews) {
    UIGraphicsBeginImageContextWithOptions(v.layer.bounds.size, NO, 0.0);
    [v.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    NSArray *docPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDirectory = [docPaths objectAtIndex:0];
    NSString *docPath = [docDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%x.png", arc4random()]];
    NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(viewImage)];
    [imageData writeToFile:docPath atomically:YES];
  }
}

当你点击按钮时，图像将被写入磁盘〜/ Library / Application Support / iPhone Simulator / x.x / Applications / {crazy-guid-for-app} / Documents /

注意：您需要#import <QuartzCore/QuartzCore.h>并将QuartzCore.framework添加到您的应用程序中。