1、绘制UIImage的圆角，并且不出现离屏渲染； 2、获取启动图片

UIImage Category.m

@implementation UIImage (CornerRadius)

- (UIImage*)cornerWithRadius:(CGFloat)radius andSize:(CGSize)size{
    CGRect rect = CGRectMake(0, 0, size.width, size.height);
    
    UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(radius, radius)];
    CGContextAddPath(ctx,path.CGPath);
    CGContextClip(ctx);
    [self drawInRect:rect];
    CGContextDrawPath(ctx, kCGPathFillStroke);
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

+ (UIImage *)getTheLaunchImage {
    CGSize viewSize = [UIScreen mainScreen].bounds.size;
    
    NSString *viewOrientation = nil;
    if (([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown) || ([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait)) {
        viewOrientation = @"Portrait";
    } else {
        viewOrientation = @"Landscape";
    }
    
    
    NSString *launchImage = nil;
    
    NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
    for (NSDictionary* dict in imagesDict)
     {
        CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
        
        if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
         {
            launchImage = dict[@"UILaunchImageName"];
         }
     }
    
    return [UIImage imageNamed:launchImage];
}


@end