//添加陰影

UIimageView *imageView = [[UIImageView alloc ] init];

imageView.layer.shadowColor = [UIColor blackColor].CGColor;

imageView.layer.shadowOffset = CGSizeMake(3,2);

imageView.layer.shadowOpacity = 0.6;

imageView.layer.shadowRadius = 1.0;

imageView.clipsToBounds = NO;

//文字描邊

只設(shè)置shadowColor，不設(shè)置shadowOffset就可以實現(xiàn)描邊效果