所需知识
一、Masonry
二、MVC设计模式
三、中缀转后缀
四、四则运算（加括号）
基本思路
首先在M、V和C的相关内容，然后通过点击按钮并向字符串中添加对应的字符，然后在M中对字符串进行相关数据处理。
按钮布局处理
使用Masony：
_buttonArray = [[NSArray alloc] initWithObjects:_buttonDelete, _buttonLeft, _buttonRight, _buttonDivide, _buttonSeven, _buttonEight, _buttonNine, _buttonMultiply, _buttonFour, _buttonFive, _buttonSix, _buttonSubtract, _buttonOne, _buttonTwo, _buttonThree, _buttonAdd, _buttonZero, _buttonPoint, _buttonEqual,nil];
_contentArray = [[NSArray alloc] initWithObjects:@"AC", @"(", @")", @"/", @"7", @"8", @"9", @"*", @"4", @"5", @"6", @"-", @"1", @"2", @"3", @"+", @"0", @".", @"=", nil];
for (int i = 0; i < 5; i++) {
if (i < 4) {
for (int j = 0; j < 4; j++) {
UIButton* button = [[UIButton alloc] init];
button = [_buttonArray objectAtIndex:4 * i + j];
if (j < 3 && i > 0) {
button.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.6];
} else if (j == 3) {
button.backgroundColor = [UIColor orangeColor];
} else if (i == 0 && j < 3) {
button.backgroundColor = [UIColor grayColor];
}
button.layer.cornerRadius = w / 2;
NSString* string = [_contentArray objectAtIndex:4 * i +j];
[button setTitle:string forState:UIControlStateNormal];
button.titleLabel.font = [UIFont systemFontOfSize:40];
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[button mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(self).offset(- H / 9 * (4 - i) - 40);
make.left.equalTo(self).offset( (W - 20) / 4 * j + 10);
make.height.equalTo(@(w));
make.width.equalTo(@(w));
}];
}
} else {
for (int j = 0; j < 3; j++) {
UIButton* button = [[UIButton alloc] init];
button = [_buttonArray objectAtIndex:j + 16];
button.layer.cornerRadius = w / 2;
NSString* string = [_contentArray objectAtIndex:j + 16];
[button setTitle:string forState:UIControlStateNormal];
button.titleLabel.font = [UIFont systemFontOfSize:40];
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
if (j == 0) {
button.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.6];
[button mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(_buttonOne).offset(H / 9);
make.left.equalTo(self).offset(10);
make.width.equalTo(@(2 * w));
make.height.equalTo(@w);
}];
} else {
if (j == 1) {
button.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.6];
} else {
button.backgroundColor = [UIColor orangeColor];
}
[button mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(_buttonOne).offset(H / 9);
make.left.equalTo(self).offset( (W - 20) / 4 * (j + 1) + 10);
make.height.equalTo(@(w));
make.width.equalTo(@(w));
}];
}
}
}
}
return self;
}
数据处理
我的数据处理中有两个主要方法，一个是判断括号是否匹配，一个是对字符串的计算。
判错处理：
我在按钮点击事件中增加了判断，对于不合法的操作禁止加入到目标字符串中。
GitHub:https://github.com/HaoQianbiao/Counter