九宫格代码

CGFloat margin = 10.0f;

CGFloat appViewWidth = (375 - 4 * margin)/3;

CGFloat appViewHeight = (375 - 4 * margin)/3;

//2. 完成布局设计

//三列

int totalloc = 3;

for (int i = 0; i < 9; i++) {

int row = i / totalloc;//行号

int loc = i % totalloc;//列号

CGFloat appViewX = margin + (margin + appViewWidth) * loc;

CGFloat appViewY = margin + (margin + appViewHeight) * row;

//创建UIView控件

UIView *appView = [[UIView alloc] initWithFrame:CGRectMake(appViewX, appViewY, appViewWidth, appViewHeight)];

appView.backgroundColor = [UIColor redColor];

[self.bgView addSubview:appView];

}