作用：在聲明屬性后，使用腳本生成getter
作用：在聲明屬性后，使用腳本生成getter
作用：在聲明屬性后，使用腳本生成getter

純手寫UI的時候，經(jīng)常會定義一堆控件，然后逐個添加getter。

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

通過下面的腳本，可以自動生成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

將上面的內(nèi)容保存為文件中，文件名 getter.sh。

假設 MyCell.m 內(nèi)容如下

@interface MyCell()

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

@end

執(zhí)行腳本grep @property MyCell.m | sh getter.sh

輸出以下內(nèi)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;
}