for循创建视图

1.for循环之 九宫格算法
//总列数
int count = 4;
//小格格尺寸
int w = 50;
int h = 50;
//算间隙
int jianXi = (self.view.frame.size.width - count * w) / 4;

for (int i = 0; i < 33; i ++) {
/*
九宫格算法:
1.间隙算法
间隙 =（屏宽 - 总列数 * 小格子宽）/ 4

2.计算行号和列号
行号 = i / 总列数
列号 = i % 总列数

3.小格子X和Y轴
X = 左边的间隙也就是X + 上面列号 * （小格子的宽 + 左边间隙）
Y = 上面的间隙也就是Y + 上面行号 * （小格子的高 + 上面间隙）
*/

//计算行号和列号，然后计算 x y值
int x = 20 + (i % count) * (w + jianXi);
int y = 25 + (i / count) * (h + jianXi);

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(x, y, w, h)];
[self.view addSubview:view];
view.backgroundColor = [UIColor redColor];
}

2.for循环之 添加按钮
//总列数
int count = 2;
//小格格尺寸
int w = 150;
int h = 80;
//算间隙
int jianXi = (bview.frame.size.width - count * w) / 4;

for (int i = 0; i < arr.count; i ++) {

//计算行号和列号，然后计算 x y值
int x = 28 + (i % count) * (w + jianXi);
int y = 20 + (i / count) * (h + jianXi);

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

btn.frame = CGRectMake(x, y, w, h);

UIImage *image = [arr objectAtIndex:i];

[btn setImage:image forState:UIControlStateNormal];

[bview addSubview:btn];

}

4.for循环之 添加tabBar按钮

for (int i = 0; i < btnArray.count; i ++) {

//取出图片
NSString *btnImage = btnArray[i];

//定义按钮对象
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

btn.frame = CGRectMake(i*375/btnArray.count, 0, 375/btnArray.count, 49);

[btn setImage:[UIImage imageNamed:btnImage] forState:UIControlStateNormal];

//按钮闪烁效果
btn.showsTouchWhenHighlighted = YES;

[backGrundView addSubview:btn];

btn.tag = 100 + i;

[btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];

//设定选中图片

selecteImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 375/btnArray.count, 49)];
selecteImage.image = [UIImage imageNamed:@"home_bottom_tab_arrow"];

[backGrundView addSubview:selecteImage];

}

}

7.循环添加按钮

/**
*  循环创建视图
*
*  @param viewCount  要创建几个视图
*  @param viewColor  视图颜色
*  @param superView  这个视图的父视图
*  @param viewMargin 视图间隙
*  @param viewSize   视图大小
*  @param viewY      视图Y值
*  @param toView     加到哪个视图上
*/
- (void)LoopCreatViewWithCount:(NSInteger)viewCount
andViewColor:(UIColor *)viewColor
andSuperView:(UIView *)superView
andViewMargin:(CGFloat)viewMargin
andViewSize:(CGSize)viewSize
andViewY:(CGFloat)viewY
andToView:(UIView  *)toView

{

NSInteger count = viewCount;

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

// 1.创建按钮
UIView *subView = [[UIView alloc] init];
subView.backgroundColor = viewColor;

// 2.设置frame
CGFloat viewWeight = superView.frame.size.width;

// 按钮的尺寸
CGFloat w = viewSize.width;
CGFloat h = viewSize.height;

// 最左边的间距 = 0.5 * (控制器view的宽度 - 按钮个数 * 按钮宽度 - (按钮个数 - 1) * 按钮之间的间距)
CGFloat leftMargin = (viewWeight - count * w - viewMargin * (count - 1)) * 0.5;

// 按钮的x = 最左边的间距 + i * (按钮宽度 + 按钮之间的间距)
CGFloat x = leftMargin + i * (w + viewMargin);
CGFloat y = 200;
subView.frame = CGRectMake(x, y, w, h);

// 5.2.4.添加
[toView addSubview:subView];

}

}

将按钮图片和线图片分别放到两个数组

CGFloat lineCount = 2;
CGFloat lineW = 2;
CGFloat lineH = self.frame.size.height;
CGFloat lineY = 0;

CGFloat btnY = 0;
CGFloat btnH = self.frame.size.height;
CGFloat btnW = (self.frame.size.width - lineCount * lineW) / 3;

// 按钮
for (int i = 0; i < self.btnArray.count; i++) {

UIButton *btn = self.btnArray[i];

CGFloat btnX = i * (btnW + 2);
btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
}

// 线
for (int i = 0; i<self.lineArray.count; i++) {
UIImageView *line = self.lineArray[i];

UIButton *btn = self.btnArray[i];
CGFloat lineX = CGRectGetMaxX(btn.frame);
line.frame = CGRectMake(lineX, lineY, lineW, lineH);
}