Xcode Code Snippets自定义代码块

iOS开发中，经常需要用一些定式的代码，比如一些控件的创建与设置，使用Code Snippets(代码块)可以大大提高开发的效率，也可以避免写代码时忘记做一些常规的处理，非常方便。

自定义Code Snippets：
在Xcode 9.0之前，可以拖代码到右侧的{ }中，然后处理，Xcode9.0之后无法选择并拖动代码块了，只能将以前写好的代码块复制到系统文件夹，然后重启Xcode即可。
自定义代码块的目录：
~/Library/Developer/Xcode/UserData/CodeSnippets
（可以使用github管理）

系统自带的Code Snippets目录：
/Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/SystemCodeSnippets.codesnippets
可以用sublime等编辑工具打开文件，然后做修改，建议先备份。

自定义Code Snippets:

Title: strong
Completion Shortcut: @strong
Completion Scopes: Class Interface Methods

@property (nonatomic, strong) <#type#> <#name#>;

Title: buttoninit
Completion Shortcut: @buttoninit 
Completion Scopes: Function or Method

UIButton *button = [[UIButton alloc] init];
button.backgroundColor = [UIColor <#backgroundColor#>];
button.titleLabel.font = [UIFont <#font#>];
[button setTitle:<#title#> forState:UIControlStateNormal];
[button setTitleColor:[UIColor <#titleColor#>] forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[<#view#> addSubview:button];

Title: borderButton
Completion Shortcut: @borderbutton 
Completion Scopes: Function or Method

UIButton *borderButton = [[UIButton alloc] init];
borderButton.layer.borderColor = [UIColor <#color#>].CGColor;
borderButton.layer.borderWidth = <#borderWidth#>;
borderButton.titleLabel.font = [UIFont <#font#>];
borderButton.clipsToBounds = YES;
borderButton.layer.cornerRadius = <#cornerRadius#>;
borderButton.backgroundColor = [UIColor <#backgroundColor#>];
[borderButton setTitleColor:[UIColor <#titleColor#>] forState:UIControlStateNormal];
[borderButton setTitle:<#title#> forState:UIControlStateNormal];
 [borderButton addTarget:self action:@selector(borderButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[<#code#> addSubview:borderButton];

Title: labelinit
Completion Shortcut: @labelinit 
Completion Scopes: Function or Method

UILabel *label = [[UILabel alloc] init];
label.font = [UIFont <#font#>];
label.text = <#text#>
label.textColor = [UIColor <#textColor#>];
label.textAlignment = NSTextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
[<#view#> addSubview:label];

Title: attributedLabel
Completion Shortcut: @attributedLabel 
Completion Scopes: Function or Method

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];

Title: tableinit
Completion Shortcut: @tableinit 
Completion Scopes: Function or Method


UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
[tableView registerClass:[<#classCell#> class] forCellReuseIdentifier:<#kReuseIdentifier#>];
tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
tableView.dataSource = self;
tableView.delegate = self;
tableView.backgroundColor=[UIColor colorWithHex:<#0xFFFFFF#>];
[<#view#> addSubview:tableView];

Title: tableDelegate
Completion Shortcut: @tableDelegate 
Completion Scopes: Class Implementation

#pragma mark - UITableViewDataSource

- (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
{

}

#pragma mark - UITableViewDelegate

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

此外，可以根据自己的项目，做一些自定义的代码块，开发效率定会大大提高。