OC链式封装进阶/终结篇（属性转为链式编程工具化实现）
iOS 中习惯了 Swift 编程之后, 再修改老代码（OC） 感觉调用特别不方便，想链式化一些内层属性，使代码调用更加简单；最终封装为一个链式属性生成器，普通属性一键转链式属性；
需要添加前缀以便和官方默认名称区分开[ 兼容 Swift ]；：将 UICollectionViewFlowLayout 属性链式化
@interface UICollectionViewFlowLayout : UICollectionViewLayout@property (nonatomic) CGSize itemSize;
@property (nonatomic) UICollectionViewScrollDirection scrollDirection;
@property (nonatomic) UIEdgeInsets sectionInset;
@property (nonatomic) BOOL sectionHeadersPinToVisibleBounds;
@end工具生成如下：
//
//UICollectionViewFlowLayout+Chain.h
//MacTemplet
//
//Created by Bin Shang on 2021/01/01 19:29
//Copyright ? 2021 Bin Shang. All rights reserved.
//
#import NS_ASSUME_NONNULL_BEGIN@interface UICollectionViewFlowLayout (Chain)@property(nonatomic, copy, readonly) UICollectionViewFlowLayout *(^itemSizeChain)(CGSize);
@property(nonatomic, copy, readonly) UICollectionViewFlowLayout *(^scrollDirectionChain)(UICollectionViewScrollDirection);
@property(nonatomic, copy, readonly) UICollectionViewFlowLayout *(^sectionInsetChain)(UIEdgeInsets);
@property(nonatomic, copy, readonly) UICollectionViewFlowLayout *(^sectionHeadersPinToVisibleBoundsChain)(BOOL);
@endNS_ASSUME_NONNULL_END
#import "UICollectionViewFlowLayout+Chain.h"@implementation UICollectionViewFlowLayout (Chain)- (UICollectionViewFlowLayout * (^)(CGSize))itemSizeChain{
return ^(CGSize value) {
self.itemSize = value;
return self;
};
}- (UICollectionViewFlowLayout * (^)(UICollectionViewScrollDirection))scrollDirectionChain{
return ^(UICollectionViewScrollDirection value) {
self.scrollDirection = value;
return self;
};
}- (UICollectionViewFlowLayout * (^)(UIEdgeInsets))sectionInsetChain{
return ^(UIEdgeInsets value) {
self.sectionInset = value;
return self;
};
}- (UICollectionViewFlowLayout * (^)(BOOL))sectionHeadersPinToVisibleBoundsChain{
return ^(BOOL value) {
self.sectionHeadersPinToVisibleBounds = value;
return self;
};
}@end
文章图片
CodeHelper.dmg
附：NSString
#import NS_ASSUME_NONNULL_BEGIN@interface NSString (Chain)
///过滤前后空格
@property (nonatomic, strong, readonly) NSString *trimmed;
/// 过滤字符集
@property(nonatomic, copy, readonly) NSString *(^trimmedBy)(NSString *);
@property(nonatomic, copy, readonly) NSString *(^trimmedBySet)(NSCharacterSet *);
@property(nonatomic, copy, readonly) NSString *(^subStringBy)(NSUInteger loc, NSUInteger len);
@property(nonatomic, copy, readonly) NSString *(^subStringFrom)(NSUInteger from);
@property(nonatomic, copy, readonly) NSString *(^subStringTo)(NSUInteger to);
@property(nonatomic, copy, readonly) NSString *(^appending)(NSString *);
@property(nonatomic, copy, readonly) NSString *(^appendingFormat)(NSString *format, ...);
@property(nonatomic, copy, readonly) NSString *(^replacingOccurrences)(NSString *, NSString *, NSStringCompareOptions);
@property(nonatomic, copy, readonly) NSString *(^replacingCharacters)(NSRange, NSString *);
@property(nonatomic, copy, readonly) NSComparisonResult (^compareBy)(NSString *, NSStringCompareOptions);
@property(nonatomic, copy, readonly) BOOL (^equalTo)(NSString *);
@property(nonatomic, copy, readonly) BOOL (^hasPrefix)(NSString *);
@property(nonatomic, copy, readonly) BOOL (^hasSuffix)(NSString *);
@property(nonatomic, copy, readonly) BOOL (^contains)(NSString *);
@property(nonatomic, copy, readonly) NSRange (^rangeBy)(NSString *, NSStringCompareOptions);
@property(nonatomic, copy, readonly, nullable) NSData *(^encoding)(NSStringEncoding);
///componentsSeparatedByString
@property(nonatomic, strong, readonly) NSArray *(^separatedBy)(NSString *);
///componentsSeparatedByString
@property(nonatomic, strong, readonly) NSArray *(^separatedBySet)(NSCharacterSet *);
@endNS_ASSUME_NONNULL_END
#import "NSString+Chain.h"@implementation NSString (Chain)- (NSString *(^)(NSString *))trimmedBy{
return ^(NSString *value) {
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:value];
NSString *result = [self stringByTrimmingCharactersInSet:set];
return result;
};
}- (NSString * (^)(NSCharacterSet * _Nonnull))trimmedBySet{
return ^(NSCharacterSet *value) {
return [self stringByTrimmingCharactersInSet:value];
};
}- (NSString * (^)(NSUInteger, NSUInteger))subStringBy{
return ^(NSUInteger loc, NSUInteger len) {
if (loc + len > self.length) {
return self;
}
NSString *result = [self substringWithRange:NSMakeRange(loc, len)];
return result;
};
}- (NSString * (^)(NSUInteger))subStringFrom{
return ^(NSUInteger value) {
return [self substringFromIndex:value];
;
};
}- (NSString * (^)(NSUInteger))subStringTo{
return ^(NSUInteger value) {
return [self substringFromIndex:value];
;
};
}- (NSString *(^)(NSString * _Nonnull))appending{
return ^(NSString *value){
return [self stringByAppendingString:value];
};
}- (NSString * _Nonnull (^)(NSString * _Nonnull, ...))appendingFormat{
return ^(NSString *format, ...){
va_list list;
va_start(list, format);
NSString *string = [[NSString alloc] initWithFormat:format arguments:list];
va_end(list);
NSString *result = [self stringByAppendingString:string];
return result;
};
}- (NSString * (^)(NSString * _Nonnull, NSString * _Nonnull, NSStringCompareOptions))replacingOccurrences{
return ^(NSString *target, NSString *replacement, NSStringCompareOptions options){
return [self stringByReplacingOccurrencesOfString:target withString:replacement options:options range:NSMakeRange(0, self.length)];
};
}- (NSString * (^)(NSRange, NSString * _Nonnull))replacingCharacters{
return ^(NSRange range, NSString *replacement){
return [self stringByReplacingCharactersInRange:range withString:replacement];
};
}- (NSComparisonResult (^)(NSString * _Nonnull, NSStringCompareOptions))compareBy{
return ^(NSString *value, NSStringCompareOptions options){
return [self compare:value options:options];
};
}- (BOOL (^)(NSString * _Nonnull))equalTo{
return ^(NSString *value){
return [self isEqualToString:value];
};
}- (BOOL (^)(NSString * _Nonnull))hasPrefix{
return ^(NSString *value){
return [self hasPrefix:value];
};
}- (BOOL (^)(NSString * _Nonnull))hasSuffix{
return ^(NSString *value){
return [self hasSuffix:value];
};
}- (BOOL (^)(NSString * _Nonnull))contains{
return ^(NSString *value){
return [self containsString:value];
};
}- (NSRange (^)(NSString * _Nonnull, NSStringCompareOptions))rangeBy{
return ^(NSString *value, NSStringCompareOptions options){
return [self rangeOfString:value options:options];
};
}- (NSData * _Nonnull (^)(NSStringEncoding))encoding{
return ^(NSStringEncoding value){
return [self dataUsingEncoding:value];
};
}- (NSArray *(^)(NSString *))separatedBy{
return ^(NSString *value) {
return [self componentsSeparatedByString: value];
};
}- (NSArray * _Nonnull (^)(NSCharacterSet * _Nonnull))separatedBySet{
return ^(NSCharacterSet *value) {
return [self componentsSeparatedByCharactersInSet:value];
};
}@end 附：NSMutableString
@interface NSMutableString (Chain)//- (void)appendString:(NSString *)aString;
@property(nonatomic, copy, readonly) NSMutableString * (^appending)(NSString *);
///- (void)appendFormat:(NSString *)format, ... NS_FORMAT_FUNCTION(1,2);
@property(nonatomic, copy, readonly) NSMutableString * (^appendingFormat)(NSString *format, ...);
///- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)aString;
@property(nonatomic, copy, readonly) NSMutableString * (^replacingCharacters)(NSRange, NSString *);
///- (NSUInteger)replaceOccurrencesOfString:(NSString *)target withString:(NSString *)replacement options:(NSStringCompareOptions)options range:(NSRange)searchRange;
@property(nonatomic, copy, readonly) NSMutableString * (^replacingOccurrences)(NSString *, NSString *, NSStringCompareOptions);
///- (void)insertString:(NSString *)aString atIndex:(NSUInteger)loc;
@property(nonatomic, copy, readonly) NSMutableString * (^insertAtIndex)(NSString *, NSUInteger);
///- (void)deleteCharactersInRange:(NSRange)range;
@property(nonatomic, copy, readonly) NSMutableString * (^deleteCharacters)(NSRange);
@end
@implementation NSMutableString (Chain)- (NSMutableString * (^)(NSString * _Nonnull))appending{
return ^(NSString *value) {
[self appendString:value];
return self;
};
}- (NSMutableString * (^)(NSString * _Nonnull, ...))appendingFormat{
return ^(NSString *format, ...){
va_list args;
va_start(args, format);
NSString *string = [[NSString alloc] initWithFormat:format arguments:args];
va_end(args);
[self appendString:string];
return self;
};
}- (NSMutableString * (^)(NSRange, NSString * _Nonnull))replacingCharacters{
return ^(NSRange range, NSString *value) {
[self replaceCharactersInRange:range withString:value];
return self;
};
}- (NSMutableString * (^)(NSString * _Nonnull, NSString * _Nonnull, NSStringCompareOptions))replacingOccurrences{
return ^(NSString *target, NSString *replacement, NSStringCompareOptions options) {
[self replaceOccurrencesOfString:target withString:replacement options:options range:NSMakeRange(0, self.length)];
return self;
};
}- (NSMutableString * (^)(NSString * _Nonnull, NSUInteger))insertAtIndex{
return ^(NSString *value, NSUInteger index) {
[self insertString:value atIndex:index];
return self;
};
}- (NSMutableString * _Nonnull (^)(NSRange))deleteCharacters{
return ^(NSRange range) {
[self deleteCharactersInRange:range];
return self;
};
}@end
附：NSMutableArray
#import NS_ASSUME_NONNULL_BEGIN@interface NSMutableArray (Helper)@property(nonatomic, copy, readonly) NSMutableArray *(^addObject)(ObjectType);
@property(nonatomic, copy, readonly) NSMutableArray *(^addObjects)(NSArray *);
@property(nonatomic, copy, readonly) NSMutableArray *(^insertAtIndex)(ObjectType, NSUInteger);
@property(nonatomic, copy, readonly) NSMutableArray *(^removeAtIndex)(NSUInteger);
@property(nonatomic, copy, readonly) NSMutableArray *(^removeObjects)(NSArray *);
@property(nonatomic, copy, readonly) NSMutableArray *(^removeAll)(void);
@property(nonatomic, copy, readonly) NSMutableArray *(^replaceAtIndex)(ObjectType, NSUInteger);
@property(nonatomic, copy, readonly) NSMutableArray *(^sort)(SEL);
@endNS_ASSUME_NONNULL_END
#import "NSMutableArray+Helper.h"@implementation NSMutableArray (Helper)- (NSMutableArray * (^)(id _Nonnull))addObject{
return ^(id obj) {
if (obj) {
[self addObject:obj];
}
return self;
};
}- (NSMutableArray * (^)(NSArray *))addObjects{
return ^(NSArray * value) {
if (value) {
[self addObjectsFromArray:value];
}
return self;
};
}- (NSMutableArray * (^)(id, NSUInteger))insertAtIndex{
return ^(id value, NSUInteger index) {
if (value) {
[self insertObject:value atIndex:index];
}
return self;
};
}- (NSMutableArray * (^)(NSUInteger))removeAtIndex{
return ^(NSUInteger index) {
if (index < self.count) {
[self removeObjectAtIndex:index];
}
return self;
};
}- (NSMutableArray * (^)(NSArray *))removeObjects{
return ^(NSArray * value) {
[self removeObjectsInArray:value];
return self;
};
}- (NSMutableArray * (^)(void))removeAll{
return ^(void) {
[self removeAllObjects];
return self;
};
}- (NSMutableArray * (^)(id, NSUInteger))replaceAtIndex{
return ^(id value, NSUInteger index) {
if (index < self.count) {
[self replaceObjectAtIndex:index withObject:value];
}
return self;
};
}- (NSMutableArray * (^)(SEL))sort{
return ^(SEL aSel) {
[self sortUsingSelector:aSel];
return self;
};
}@end
【OC链式封装进阶/终结篇（属性转为链式编程工具化实现）】Swift 链式编程库： SwiftChain
另类实现点语法：Then
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