版本记录
| 版本号 | 时间 |
|---|---|
| V1.0 | 2017.12.16 |
前言
NSArray是我们经常使用的一个类，但是苹果的API很多用起来不是那么方便，需要根据我们特殊需求进行个性化的改变和定制，接下来，我就写一个NSArray分类工具，以后在使用的时候直接调用这个分类中的方法，可以实现很多小的功能，用起来也很方便。相关代码已经上传至GitHub - 刀客传奇。
数组的去重
与NSSet不同，数组NSArray是可以有重复元素的，那么如果对数组中的元素进行去重呢，下面看一下代码。
//数组去重复
- (NSArray *)jj_distinctSameElements;
//数组去重
- (NSArray *)jj_distinctSameElements
{
NSMutableOrderedSet *set = [NSMutableOrderedSet orderedSetWithArray:self];
return [set array];
}
下面我们调用一下
- (void)deleteSameElements
{
NSArray *arr = @[@"one", @"two", @"three", @"one"];
NSArray *result = [arr jj_distinctSameElements];
NSLog(@"result = %@", result);
}
看输出结果
2017-12-16 18:00:40.858021+0800 JJNSArrayTool[14907:258361] result = (
one,
two,
three
)
可见，数组去重了。
Masonry中的NSArray分类
下面大家就看一下Masonry中NSArray的分类。
1. NSArray+MASAdditions.h
#import "MASUtilities.h"
#import "MASConstraintMaker.h"
#import "MASViewAttribute.h"
typedef NS_ENUM(NSUInteger, MASAxisType) {
MASAxisTypeHorizontal,
MASAxisTypeVertical
};
@interface NSArray (MASAdditions)
/**
* Creates a MASConstraintMaker with each view in the callee.
* Any constraints defined are added to the view or the appropriate superview once the block has finished executing on each view
*
* @param block scope within which you can build up the constraints which you wish to apply to each view.
*
* @return Array of created MASConstraints
*/
- (NSArray *)mas_makeConstraints:(void (^)(MASConstraintMaker *make))block;
/**
* Creates a MASConstraintMaker with each view in the callee.
* Any constraints defined are added to each view or the appropriate superview once the block has finished executing on each view.
* If an existing constraint exists then it will be updated instead.
*
* @param block scope within which you can build up the constraints which you wish to apply to each view.
*
* @return Array of created/updated MASConstraints
*/
- (NSArray *)mas_updateConstraints:(void (^)(MASConstraintMaker *make))block;
/**
* Creates a MASConstraintMaker with each view in the callee.
* Any constraints defined are added to each view or the appropriate superview once the block has finished executing on each view.
* All constraints previously installed for the views will be removed.
*
* @param block scope within which you can build up the constraints which you wish to apply to each view.
*
* @return Array of created/updated MASConstraints
*/
- (NSArray *)mas_remakeConstraints:(void (^)(MASConstraintMaker *make))block;
/**
* distribute with fixed spacing
*
* @param axisType which axis to distribute items along
* @param fixedSpacing the spacing between each item
* @param leadSpacing the spacing before the first item and the container
* @param tailSpacing the spacing after the last item and the container
*/
- (void)mas_distributeViewsAlongAxis:(MASAxisType)axisType withFixedSpacing:(CGFloat)fixedSpacing leadSpacing:(CGFloat)leadSpacing tailSpacing:(CGFloat)tailSpacing;
/**
* distribute with fixed item size
*
* @param axisType which axis to distribute items along
* @param fixedItemLength the fixed length of each item
* @param leadSpacing the spacing before the first item and the container
* @param tailSpacing the spacing after the last item and the container
*/
- (void)mas_distributeViewsAlongAxis:(MASAxisType)axisType withFixedItemLength:(CGFloat)fixedItemLength leadSpacing:(CGFloat)leadSpacing tailSpacing:(CGFloat)tailSpacing;
@end
2. NSArray+MASAdditions.m
#import "NSArray+MASAdditions.h"
#import "View+MASAdditions.h"
@implementation NSArray (MASAdditions)
- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *make))block {
NSMutableArray *constraints = [NSMutableArray array];
for (MAS_VIEW *view in self) {
NSAssert([view isKindOfClass:[MAS_VIEW class]], @"All objects in the array must be views");
[constraints addObjectsFromArray:[view mas_makeConstraints:block]];
}
return constraints;
}
- (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *make))block {
NSMutableArray *constraints = [NSMutableArray array];
for (MAS_VIEW *view in self) {
NSAssert([view isKindOfClass:[MAS_VIEW class]], @"All objects in the array must be views");
[constraints addObjectsFromArray:[view mas_updateConstraints:block]];
}
return constraints;
}
- (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block {
NSMutableArray *constraints = [NSMutableArray array];
for (MAS_VIEW *view in self) {
NSAssert([view isKindOfClass:[MAS_VIEW class]], @"All objects in the array must be views");
[constraints addObjectsFromArray:[view mas_remakeConstraints:block]];
}
return constraints;
}
- (void)mas_distributeViewsAlongAxis:(MASAxisType)axisType withFixedSpacing:(CGFloat)fixedSpacing leadSpacing:(CGFloat)leadSpacing tailSpacing:(CGFloat)tailSpacing {
if (self.count < 2) {
NSAssert(self.count>1,@"views to distribute need to bigger than one");
return;
}
MAS_VIEW *tempSuperView = [self mas_commonSuperviewOfViews];
if (axisType == MASAxisTypeHorizontal) {
MAS_VIEW *prev;
for (int i = 0; i < self.count; i++) {
MAS_VIEW *v = self[i];
[v mas_makeConstraints:^(MASConstraintMaker *make) {
if (prev) {
make.width.equalTo(prev);
make.left.equalTo(prev.mas_right).offset(fixedSpacing);
if (i == self.count - 1) {//last one
make.right.equalTo(tempSuperView).offset(-tailSpacing);
}
}
else {//first one
make.left.equalTo(tempSuperView).offset(leadSpacing);
}
}];
prev = v;
}
}
else {
MAS_VIEW *prev;
for (int i = 0; i < self.count; i++) {
MAS_VIEW *v = self[i];
[v mas_makeConstraints:^(MASConstraintMaker *make) {
if (prev) {
make.height.equalTo(prev);
make.top.equalTo(prev.mas_bottom).offset(fixedSpacing);
if (i == self.count - 1) {//last one
make.bottom.equalTo(tempSuperView).offset(-tailSpacing);
}
}
else {//first one
make.top.equalTo(tempSuperView).offset(leadSpacing);
}
}];
prev = v;
}
}
}
- (void)mas_distributeViewsAlongAxis:(MASAxisType)axisType withFixedItemLength:(CGFloat)fixedItemLength leadSpacing:(CGFloat)leadSpacing tailSpacing:(CGFloat)tailSpacing {
if (self.count < 2) {
NSAssert(self.count>1,@"views to distribute need to bigger than one");
return;
}
MAS_VIEW *tempSuperView = [self mas_commonSuperviewOfViews];
if (axisType == MASAxisTypeHorizontal) {
MAS_VIEW *prev;
for (int i = 0; i < self.count; i++) {
MAS_VIEW *v = self[i];
[v mas_makeConstraints:^(MASConstraintMaker *make) {
make.width.equalTo(@(fixedItemLength));
if (prev) {
if (i == self.count - 1) {//last one
make.right.equalTo(tempSuperView).offset(-tailSpacing);
}
else {
CGFloat offset = (1-(i/((CGFloat)self.count-1)))*(fixedItemLength+leadSpacing)-i*tailSpacing/(((CGFloat)self.count-1));
make.right.equalTo(tempSuperView).multipliedBy(i/((CGFloat)self.count-1)).with.offset(offset);
}
}
else {//first one
make.left.equalTo(tempSuperView).offset(leadSpacing);
}
}];
prev = v;
}
}
else {
MAS_VIEW *prev;
for (int i = 0; i < self.count; i++) {
MAS_VIEW *v = self[i];
[v mas_makeConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(@(fixedItemLength));
if (prev) {
if (i == self.count - 1) {//last one
make.bottom.equalTo(tempSuperView).offset(-tailSpacing);
}
else {
CGFloat offset = (1-(i/((CGFloat)self.count-1)))*(fixedItemLength+leadSpacing)-i*tailSpacing/(((CGFloat)self.count-1));
make.bottom.equalTo(tempSuperView).multipliedBy(i/((CGFloat)self.count-1)).with.offset(offset);
}
}
else {//first one
make.top.equalTo(tempSuperView).offset(leadSpacing);
}
}];
prev = v;
}
}
}
- (MAS_VIEW *)mas_commonSuperviewOfViews
{
MAS_VIEW *commonSuperview = nil;
MAS_VIEW *previousView = nil;
for (id object in self) {
if ([object isKindOfClass:[MAS_VIEW class]]) {
MAS_VIEW *view = (MAS_VIEW *)object;
if (previousView) {
commonSuperview = [view mas_closestCommonSuperview:commonSuperview];
} else {
commonSuperview = view;
}
previousView = view;
}
}
NSAssert(commonSuperview, @"Can't constrain views that do not share a common superview. Make sure that all the views in this array have been added into the same view hierarchy.");
return commonSuperview;
}
@end
ReactiveObjC中NSArray的分类
1. NSArray+RACSequenceAdditions.h
#import
@class RACSequence<__covariant ValueType>;
NS_ASSUME_NONNULL_BEGIN
@interface NSArray<__covariant ObjectType> (RACSequenceAdditions)
/// Creates and returns a sequence corresponding to the receiver.
///
/// Mutating the receiver will not affect the sequence after it's been created.
@property (nonatomic, copy, readonly) RACSequence *rac_sequence;
@end
NS_ASSUME_NONNULL_END
2. NSArray+RACSequenceAdditions.m
#import "NSArray+RACSequenceAdditions.h"
#import "RACArraySequence.h"
@implementation NSArray (RACSequenceAdditions)
- (RACSequence *)rac_sequence {
return [RACArraySequence sequenceWithArray:self offset:0];
}
@end
后记
未完，待续~~~
