iOS 生成代码一：属性生成getter

作用：在声明属性后，使用脚本生成getter
作用：在声明属性后，使用脚本生成getter
作用：在声明属性后，使用脚本生成getter

纯手写UI的时候，经常会定义一堆控件，然后逐个添加getter。

@property (nonatomic, strong) UILabel *topTitleLabel;
@property (nonatomic, strong) UILabel *contentLabel;

通过下面的脚本，可以自动生成getter

awk '{propertyname=substr($5,2,length($5)-2);
    property="_"propertyname;
    if ($4 == "UILabel") print "- (UILabel *)" propertyname "{\n    if (!"property") {\n        "property" = [[UILabel alloc] init];\n\n        "property".textColor = UIColorFromRGB(0x22222);\n       "property".font = [UIFont systemFontOfSize:12];\n   }\n return "property";\n}\n";
    else if (match($3,assign)) print "";
    else print "- ("$4" *)" propertyname "{\n   if (!"property") {\n        "property" = [["$4" alloc] init];\n }\n return "property"\n}"
}' $1

将上面的内容保存为文件中，文件名 getter.sh。

假设 MyCell.m 内容如下

@interface MyCell()

@property (nonatomic, strong) UILabel *topTitleLabel;
@property (nonatomic, strong) UILabel *contentLabel;

@end

执行脚本grep @property MyCell.m | sh getter.sh

输出以下内容

- (UILabel *)topTitleLabel{
    if (!_topTitleLabel) {
        _topTitleLabel = [[UILabel alloc] init];

        _topTitleLabel.textColor = UIColorFromRGB(0x22222);
        _topTitleLabel.font = [UIFont systemFontOfSize:12];
    }
    return _topTitleLabel;
}

- (UILabel *)contentLabel{
    if (!_contentLabel) {
        _contentLabel = [[UILabel alloc] init];

        _contentLabel.textColor = UIColorFromRGB(0x22222);
        _contentLabel.font = [UIFont systemFontOfSize:12];
    }
    return _contentLabel;
}