关于把图片内容绘制到view中

1、把图片内容绘制到view中需要调用的方法

   原理：见官方文档

// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    // Drawing code    for (int i = 0; i < [self.imageLayerNameArray count]; i++)    {        NSString *imageName =[self.imageLayerNameArray objectAtIndex:i];             NDLog(@"%@",imageName);                NSString *imagePath = [NDTCacheCustomPath getResourcePath:imageName];        UIImage *image = [[UIImage alloc]initWithContentsOfFile:imagePath];        [image drawInRect:rect];    }}

2、如果需要重绘，没必要重新创建view，调用

   

-(void)setImageLayerNameArray:(NSMutableArray *)imageLayerNameArray{    _imageLayerNameArray = imageLayerNameArray;    [self setNeedsDisplay];}

setneedsdisplay方法，原理，见官方文档