用宏定义行高，行宽，行数，列数及间隔
#define ROW_COUNT 5
#define COLUMN_COUNT 3
#define ROW_HEIGHT 100
#define ROW_WIDTH ROW_HEIGHT
#define CELL_SPACING 10
- (void)viewDidLoad {
[super viewDidLoad];
[self layoutUI];
}
-(void)layoutUI{
_imageViews = [NSMutableArray array];
//5行3列图片数据放到可变数组中
for (int r=0; r<ROW_COUNT; r++) {
for (int c=0; c<COLUMN_COUNT; c++) {
UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(c*ROW_WIDTH+(c*CELL_SPACING), r*ROW_HEIGHT+(r*CELL_SPACING ), ROW_WIDTH, ROW_HEIGHT)];
imageView.contentMode=UIViewContentModeScaleAspectFit;
[self.view addSubview:imageView];
[_imageViews addObject:imageView];
}
}
}