获取网络图片的宽高

headerImageView.contentMode = UIViewContentModeScaleAspectFit;

[headerScrollView addSubview :headerImageView];

int imgWidth = headerImageView .image .size .width ;
                int imgHight = headerImageView .image .size .height ;

                int aWidth = headerImageView .image .size .width /headerImageView .frame .size .width ;

                int LastWidth = imgWidth/aWidth;
                int LastHight = imgHight/aWidth;

//视频暂停图片
                UIImageView *imageee = [[ UIImageView alloc ] initWithFrame :CGRectMake((SCREEN_WIDTH- 1 0 0 )/ 2 , (SCREEN_HEIGHT- 1 0 0 )/ 2 , 3 7 0 / 2 , 3 1 0 / 2 )];
                imageee .image = LOAD_IMAGE( @"newhouse_mov_stop" );
                imageee .center = headerImageView .center ;
                [headerScrollView addSubview :imageee];

                UIButton *movbtn = [[ UIButton alloc ] initWithFrame :CGRectMake( 0 +i* SCREEN_WIDTH , 0 , LastWidth , LastHight)];
                movbtn .backgroundColor = [ UIColor clearColor ];
                movbtn .tag = 4 0 0 +i;
                [movbtn addTarget : self action : @selector (doBoFang:) forControlEvents :UIControlEventTouchUpInside];
                movbtn .center = headerImageView .center ;
                [headerScrollView addSubview :movbtn];