Masonry和SnapKit分别是OC、Swift的界面布局框架，而且开发者相同。
分别用这两个框架实现一个简单计算器界面：
完全代码：LearniOSByProject/101-MasonryDemo 和 LearniOSByProject/114-SnapKitDemo
- 显示区域和键盘区域：
//申明区域，displayView是显示区域，keyboardView是键盘区域
UIView *displayView = [UIView new];
[displayView setBackgroundColor:[UIColor blackColor]];
[self.view addSubview:displayView];
UIView *keyboardView = [UIView new];
[self.view addSubview:keyboardView];
//displView（显示结果区域）和 keyboardView（键盘区域）
[displayView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.view.mas_top);
make.left.and.right.equalTo(self.view);
// displView是keyboardView的0.3倍，也就是前者是3份，后者是10份。整个屏幕的占比是前者3/13,后者10/13
make.height.equalTo(keyboardView).multipliedBy(0.3f);
}];
[keyboardView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(displayView.mas_bottom);
make.bottom.equalTo(self.view.mas_bottom);
make.left.and.right.equalTo(self.view);
}];
//设置显示位置的数字为0
UILabel *displayNum = [[UILabel alloc]init];
[displayView addSubview:displayNum];
displayNum.text = @"0";
displayNum.font = [UIFont fontWithName:@"HeiTi SC" size:70];
displayNum.textColor = [UIColor whiteColor];
displayNum.textAlignment = NSTextAlignmentRight;
[displayNum mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.and.right.equalTo(displayView).with.offset(-10);
make.bottom.equalTo(displayView).with.offset(-10);
}];
- 键盘区域和约束
//定义键盘键名称，？号代表合并的单元格
NSArray *keys = @[@"AC",@"+/-",@"%",@"÷"
,@"7",@"8",@"9",@"x"
,@"4",@"5",@"6",@"-"
,@"1",@"2",@"3",@"+"
,@"0",@"?",@".",@"="];
int indexOfKeys = 0;
for (NSString *key in keys){
//循环所有键
indexOfKeys++;
int rowNum = (indexOfKeys % 4 == 0) ? indexOfKeys/4 : (indexOfKeys/4 + 1);
int colNum = (indexOfKeys % 4 == 0) ? 4 : indexOfKeys % 4;
NSLog(@"index is:%d and row:%d,col:%d",indexOfKeys,rowNum,colNum);
//键样式
UIButton *keyView = [UIButton buttonWithType:UIButtonTypeCustom];
[keyboardView addSubview:keyView];
[keyView setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[keyView setTitle:key forState:UIControlStateNormal];
[keyView.layer setBorderWidth:1];
[keyView.layer setBorderColor:[[UIColor blackColor]CGColor]];
[keyView.titleLabel setFont:[UIFont fontWithName:@"Arial-BoldItalicMT" size:30]];
//键约束
[keyView mas_makeConstraints:^(MASConstraintMaker *make) {
//处理 0 合并单元格
if([key isEqualToString:@"0"] || [key isEqualToString:@"?"] ){
if([key isEqualToString:@"0"]){
[keyView mas_makeConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(keyboardView.mas_height).with.multipliedBy(.2f);
make.width.equalTo(keyboardView.mas_width).multipliedBy(.5);
make.left.equalTo(keyboardView.mas_left);
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.92f);
}];
}if([key isEqualToString:@"?"]){
[keyView removeFromSuperview];
}
}
//正常的单元格
else{
make.width.equalTo(keyboardView.mas_width).with.multipliedBy(.25f);
make.height.equalTo(keyboardView.mas_height).with.multipliedBy(.2f);
//按照行和列添加约束，这里添加行约束
switch (rowNum) {
case 1:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.12f);
}
break;
case 2:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.32f);
}
break;
case 3:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.52f);
}
break;
case 4:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.72f);
}
break;
case 5:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.92f);
}
break;
default:
break;
}
//按照行和列添加约束，这里添加列约束
switch (colNum) {
case 1:
{
make.left.equalTo(keyboardView.mas_left);
}
break;
case 2:
{
make.right.equalTo(keyboardView.mas_centerX);
}
break;
case 3:
{
make.left.equalTo(keyboardView.mas_centerX);
}
break;
case 4:
{
make.right.equalTo(keyboardView.mas_right);
}
break;
default:
break;
}
}
}];
}
参考：忘记记录了