常用的Code Snippets

Code Snippets

通过code snippets,我们可以创建一些可重用的代码块,并且在任何需要的地方很容易的就可以使用这些代码块。

NSHipster - code snippets中有不少code sinppets。

另外,我们可能常常需要转移或者同步到别的电脑上,那么我们就需要知道这些Code Snippets存放的位置:

~/Library/Developer/Xcode/UserData/CodeSnippets

知道这些文件在哪,其他就好办了。

接下来记录项目当中常用的一些code snippets:

__strong self

  • Title:__strong self
  • Summary:Declare strong reference to weak reference
  • Completion Shorcut:_strong self
  • Completion Scopes:Function or Method
__strong __typeof(<#weakSelf#>)strongSelf = <#weakSelf#>;

__weak self

  • Title:__weak self
  • Summary:Declare weak reference to strong referencee
  • Completion Shorcut:__weak self
  • Completion Scopes:Function or Method
__weak __typeof(self) <#weakSelf#> = self;

Annotation

  • Title:Annotation Pandect
  • Summary:注释
  • Completion Shorcut:annotation
  • Completion Scopes:All
/**
 * <#annotation#>
 */

Warning

  • Title:Warning
  • Summary:警告
  • Completion Shorcut:warn
  • Completion Scopes:All
#warning mark - <#warning#>

Assign

  • Title:Assign Property
  • Summary:declare assign property
  • Completion Shorcut:@property assign
  • Completion Scopes:Class Interface Methods
@property (nonatomic, assign) <#Object#> <#obj#>;

Readonly

  • Title:Readonly Property
  • Summary:declare readonly property
  • Completion Shorcut:@property readonly
  • Completion Scopes:Class Interface Methods
@property (nonatomic, readonly) <#Object#> *<#obj#>;

Strong

  • Title:Strong Property
  • Summary:declare strong property
  • Completion Shorcut:@property strong
  • Completion Scopes:Class Interface Methods
@property (nonatomic, strong) <#Object#> *<#obj#>;

Weak

  • Title:Weak Property
  • Summary:declare weak property
  • Completion Shorcut:@property weak
  • Completion Scopes:`Class Interface Methods
@property (nonatomic, weak) <#id#> <#obj#>;

Class Continuation

  • Title:Class Continuation
  • Summary:Anonymous category to define private methods in an implementation
  • Completion Shorcut:class continuation
  • Completion Scopes:Top Level
@interface <#Class Name#> ()

<#Continuation#>

@end

dispatch_async

  • Title:dispatch_async Pattern for Background Processing
  • Summary:Dispatch to do work in the background, and then to the main queue with the results
  • Completion Shorcut:dispatch_async
  • Completion Scopes:Function or Method
dispatch_async(dispatch_get_global_queue(<#dispatch_queue_priority_t priority#>, <#unsigned long flags#>), ^(void) {
        <#code#>
        
        dispatch_async(dispatch_get_main_queue(), ^(void) {
            <#code#>
        });
    });

Documents Directory Path

  • Title:Documents Directory Path
  • Summary:文件主路径
  • Completion Shorcut:documents directory
  • Completion Scopes:Function or Method
NSURL *documentsDirectoryURL = [NSURL fileURLWithPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]];

ImageView

  • Title:ImageView
  • Summary:Create & Initialize UIImageView with Named Image
  • Completion Shorcut:imageNamed
  • Completion Scopes:Code Expression
[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"<#image name#>"]]

init

  • Title:init
  • Summary:Designated incantation for your designated initializers
  • Completion Shorcut:init self
  • Completion Scopes:Function or Method
self = [super init];
    if (!self) {
        return nil;
    }
    
    <#initializations#>
    
    return self;

NSCoding Protocol Methods

  • Title:NSCoding Protocol Methods
  • Summary:Placeholders for NSCoding protocol methods
  • Completion Shorcut:nscoding protocol
  • Completion Scopes:Class Implementation
#pragma mark - NSCoding

- (instancetype)initWithCoder:(NSCoder *)decoder {
    self = [super init];
    if (!self) {
        return nil;
    }
    
    <# implementation #>
    
    return self;
}

- (void)encodeWithCoder:(NSCoder *)coder {
    <# implementation #>
}

NSLocalizedString

  • Title:NSLocalizedString
  • Summary:本地化
  • Completion Shorcut:local string
  • Completion Scopes:Code Expression
 NSLocalizedString(@"<#Message#>", <#Comment#>)

Pragma Mark

  • Title:Pragma Mark
  • Summary:标记
  • Completion Shorcut:mark
  • Completion Scopes:Class Interface MethodsClass ImplementationTop Level
#pragma mark - <#mark#>

Remove Notification Observer

  • Title:Remove Notification Observer
  • Summary:移除notification的观察者
  • Completion Shorcut:remove observer
  • Completion Scopes:Function or Method
[[NSNotificationCenter defaultCenter] removeObserver:self];

Set Frame

  • Title:Set Frame
  • Summary:Initializes a view frame inside a code block
  • Completion Shorcut:set view frame
  • Completion Scopes:Function or Method
<# view #>.frame = ({
        CGRect frame = <# view #>.frame;
        <# ... #>
        frame;
    });

Shared Singleton

  • Title:Shared Singleton
  • Summary:Class method that returns a singleton instance
  • Completion Shorcut:shared singleton
  • Completion Scopes:Class Implementation
+ (instancetype)shared<#name#> {
    static <#class#> *_shared<#name#> = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _shared<#name#> = <#initializer#>;
    });
    
    return _shared<#name#>;
}

Specta Test Case

  • Title:Specta Test Case
  • Summary:declare a speca test case
  • Completion Shorcut:test case
  • Completion Scopes:Top level
describe(<#NSString *name#>, ^{
    <#code#>
    
    context(<#NSString *name#>, ^{
        
        beforeEach(^{
            <#code#>
        });
        
        it(<#NSString *name#>, ^{
            <#code#>
        });
    });
    
});

String Format

  • Title:String Format
  • Completion Shorcut:string format
  • Completion Scopes:Function or Method
[NSString stringWithFormat:<#(nonnull NSString *), ...#>]

UIPickerViewDataSource

  • Title:UIPickerViewDataSource
  • Summary:Placeholders for required UIPickerView datasource methods
  • Completion Shorcut:picker view datasource
  • Completion Scopes:Class Implementation
#pragma mark - UIPickerDataSource

- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
    return <#number#>
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return <#number#>
}

UIPickerViewDelegate

  • Title:UIPickerViewDelegate
  • Summary:Placeholders for required UIPickerView Delegate methods
  • Completion Shorcut:picker view delegate
  • Completion Scopes:Class Implementation
#pragma mark - UIPickerViewDelegate

- (NSString *)pickerView:(UIPickerView *)pickerView
             titleForRow:(NSInteger)row
            forComponent:(NSInteger)component
{
    <#code#>
}

- (void)pickerView:(UIPickerView *)pickerView
      didSelectRow:(NSInteger)row
       inComponent:(NSInteger)component
{
    <#code#>
}

UITableViewDataSource

  • Title:UITableViewDataSource
  • Summary:Placeholders for required UITableViewDataSource delegate methods
  • Completion Shorcut:table view datasource
  • Completion Scopes:Class Implementation
#pragma mark - UITableViewDataSource

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

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

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

- (void)configureCell:(UITableViewCell *)cell
    forRowAtIndexPath:(NSIndexPath *)indexPath
{
    <#statements#>
}

UITableViewDelegate

  • Title:UITableViewDelegate
  • Summary:Placeholders for required UITableViewDelegate protocol methods
  • Completion Shorcut:table view didselect
  • Completion Scopes:Class Implementation
#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    <#statements#>
}
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