Xcode 自定义代码片段

1.定义

代码片段(Code Snippets)，能够快速的完成经常使用的代码，提升效率。例如输入if回车出现的就是系统已经定义好的代码片段。

2.复用

自定义的代码片段是能直接拷贝的，即使换电脑后也能直接复用，储存位置为：
/用户/~/Library/Developer/Xcode/UserData/CodeSnippets

3.创建

选中代码块，按住option，拖动代码块到右侧位置，弹出编辑框

编辑.jpeg
使用.jpeg

4.常用代码块整理

4.0 其他常用功能

Title: weakSelf
Completion Shortcut: weakSelf
__weak typeof(self) weakSelf = self;

Title: 一句移除所有子控件
Completion Shortcut: ** removeFormSuper**
[<#view#>.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

Title: SharedInstance
Completion Shortcut: SharedInstance

+ (instancetype)sharedInstance
{
    static id _sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedInstance = [[self alloc] init];
    });
    return _sharedInstance;
}

Title: 设置阴影
Completion Shortcut: setShadow

<#view#>.layer.shadowColor = [UIColor whiteColor].CGColor;
<#view#>.layer.shadowOpacity = 1.0f;
<#view#>.layer.shadowRadius = 5.f;
<#view#>.layer.shadowOffset = CGSizeMake(0,0);

4.1变量声明

Title: Static NSString
Completion Shortcut: @staticString
static NSString* const <#name#> = <#value#>;

Title: Static NSInteger
Completion Shortcut: @staticInt
static NSInteger const <#name#> = <#value#>;

4.2 声明

Title: @property - assign
Completion Shortcut: @assign
property (nonatomic, assign) <#type#> *<#name#>;

Title: @property - strong
Completion Shortcut: @strong
property (nonatomic, strong) <#type#> *<#name#>;

Title: @property - copy
Completion Shortcut: @copy
property (nonatomic, copy) <#type#> *<#name#>;

Title: @property - weak
Completion Shortcut: @weak
property (nonatomic, weak) <#type#> *<#name#>;

Title: @property - delegate
Completion Shortcut: @delegate
property (nonatomic,weak) id<<#protocol#>> <#delegate#>;

4.3 注释

Title: 注释-1行
Completion Shortcut: Mark1
#pragma mark - <#name#>

Title: 注释-2行
Completion Shortcut: Mark2
#pragma mark
#pragma mark --

4.4.1 UI --- Label

Title: AttributedLabel
Completion Shortcut: attributedLabel

UILabel *attributedLabel =[[UILabel alloc] init];
attributedLabel.numberOfLines = 0;
attributedLabel.preferredMaxLayoutWidth = <#preferredMaxLayoutWidth#>;
attributedLabel.backgroundColor = [UIColor clearColor];
NSString *text = <#text#>;
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
style.lineSpacing = <#lineSpacing#>;
NSDictionary *attr = @{
    NSFontAttributeName: [UIFont <#font#>],
    NSParagraphStyleAttributeName: style,
    NSForegroundColorAttributeName: [UIColor <#color#>]
};
attributedLabel.attributedText = [[NSAttributedString alloc] initWithString:text attributes:attr];
[<#view#> addSubview:attributedLabel];

4.4.2 UI --- TableView

Title: TableView-初始化
Completion Shortcut: getTableView

- (UITableView *)tableView {
    if (!_tableView) {
        
        _tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 100) style:UITableViewStylePlain];
        _tableView.delegate = self;
        _tableView.dataSource = self;
        _tableView.backgroundColor = [UIColor clearColor];
        _tableView.scrollEnabled = NO;
        
        _tableView.estimatedRowHeight = 80;
        _tableView.rowHeight = UITableViewAutomaticDimension;
        _tableView.estimatedSectionFooterHeight = 0;
        _tableView.estimatedSectionHeaderHeight = 0;
        
        _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
        [_tableView setSeparatorColor:[UIColor whiteColor]];
        [_tableView setSeparatorInset:UIEdgeInsetsMake(0, 0, 0, 0)];
    }
    return _tableView;
}

Title: TableView-数据源方法
Completion Shortcut: ** getTableViewMethod**

#pragma mark
#pragma mark -- TableView DataSource/Delegate

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return <#count#>;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return <#count#>;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    <#classCell#> *cell = [tableView dequeueReusableCellWithIdentifier:<#kReuseIdentifier#> forIndexPath:indexPath];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:NO];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return <#rowHeight#>;
}

Title: TableViewCell-重写
Completion Shortcut: getTableViewCell

+ (RTHomeCell *)getHomeCellWithTableView:(UITableView *)tableView ID:(NSString *)ID{
    
    RTHomeCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
        cell = [[self alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
        
        cell.backgroundColor = [UIColor clearColor];
        FTView *selView = [FTView getViewWithFrame:cell.frame bgColor:UIColorFromRGB(0x5be4fd,0.2)];
        cell.selectedBackgroundView = selView;
    }
    return cell;
}

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        [self setupUI];
    }
    return self;
}

- (void)setupUI {
    
}

4.4.3 UI - CollectionView

Title: CollectionView-初始化
Completion Shortcut: getCollectionView

- (void)collectionView {
    if(!_collectionView){
        // 1.初始化layout
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init];
        layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
        layout.itemSize = CGSizeMake(<#itemWidth#>, <#itemHeight#>);
        layout.minimumInteritemSpacing = <#间距#>;
        layout.minimumLineSpacing = <#行距#>;
        
        // 2.初始化collectionView
        _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(<#x#>, <#y#>, <#w#>, <#h#>) collectionViewLayout:layout];
        _collectionView.backgroundColor = [UIColor clearColor];
        _collectionView.dataSource = self;
        _collectionView.delegate = self;
        _collectionView.showsHorizontalScrollIndicator = NO;
        _collectionView.contentInset = UIEdgeInsetsMake(0, 12, 0, 12);
        [<#view#> addSubview:_collectionView];
        
        // 3.注册cell
        [_collectionView registerClass:[<#CellClass#> class] forCellWithReuseIdentifier:<#CellID#>];
    }
    return _collectionView;
}

Title: CollectionView-数据源方法
Completion Shortcut: getCollectionViewMethod

#pragma mark
#pragma mark -- CollectionView DataSource/Delegate

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return <#count#>;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    UICollectionViewCell* cell =  [collectionView dequeueReusableCellWithReuseIdentifier:<#CellID#> forIndexPath:indexPath];
   
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    
}

Title: CollectionView-停在固定位置
Completion Shortcut: getCollectionViewStopFixedposition

// Cell滚动到指定位置
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
    // topCollView 滑动时停在指定位置
    if (scrollView == _topCollView) {
        CGPoint originalTargetContentOffset = CGPointMake(targetContentOffset->x, targetContentOffset->y);
        CGPoint targetCenter = CGPointMake(originalTargetContentOffset.x + CGRectGetWidth(self.topCollView.bounds)/2, CGRectGetHeight(self.topCollView.bounds) / 2);
        NSIndexPath *indexPath = nil;
        NSInteger i = 0;
        while (indexPath == nil) {
            targetCenter = CGPointMake(originalTargetContentOffset.x + CGRectGetWidth(self.topCollView.bounds)/2 + 10*i, CGRectGetHeight(self.topCollView.bounds) / 2);
            indexPath = [self.topCollView indexPathForItemAtPoint:targetCenter];
            detailIndex = indexPath.item;
            i++;
        }
        //    self.selectedIndex = indexPath;
        //这里用attributes比用cell要好很多，因为cell可能因为不在屏幕范围内导致cellForItemAtIndexPath返回nil
        UICollectionViewLayoutAttributes *attributes = [self.topCollView.collectionViewLayout layoutAttributesForItemAtIndexPath:indexPath];
        if (attributes) {
            *targetContentOffset = CGPointMake(attributes.center.x - CGRectGetWidth(self.topCollView.bounds)/2+30, originalTargetContentOffset.y);
        } else {
            //            NSLog(@"center is %@; indexPath is {%@, %@}; cell is %@",NSStringFromCGPoint(targetCenter), @(indexPath.section), @(indexPath.item), attributes);
        }
    }
}