循环创建按钮

CGFloat margin = 22;

CGFloat btnW = 35;

CGFloat btnH = 35;

int cloums = 7;

CGFloat btnLeft = (self.view.frame.size.width - (btnW * cloums) - (cloums - 1) * margin) / 2;

for (int i = 0; i < 30; i++) {

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

// 行的索引

int colIdx = i % cloums;

// 列的索引

int rowIdx = i / cloums;

CGFloat btnX = btnLeft + colIdx * (btnW + margin);

CGFloat btnY = 0 + rowIdx * (btnH + margin);

button.frame = CGRectMake(btnX, btnY, btnW, btnH);

button.backgroundColor = [UIColor redColor];

[self.view addSubview:button];

}