• 修改UITextField中Placeholder的文字顏色

[text setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

• 修改Label中不同文字顏色

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];
}

- (void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {
    // string為整體字符串, editStr為需要修改的字符串
    NSRange range = [string rangeOfString:editStr];

    NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];

    // 設(shè)置屬性修改字體顏色UIColor與大小UIFont
    [attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];

    self.label.attributedText = attribute;
}

• layoutSubviews調(diào)用的調(diào)用時(shí)機(jī)

* 當(dāng)視圖第一次顯示的時(shí)候會(huì)被調(diào)用
* 當(dāng)這個(gè)視圖顯示到屏幕上了,點(diǎn)擊按鈕
* 添加子視圖也會(huì)調(diào)用這個(gè)方法
* 當(dāng)本視圖的大小發(fā)生改變的時(shí)候是會(huì)調(diào)用的
* 當(dāng)子視圖的frame發(fā)生改變的時(shí)候是會(huì)調(diào)用的
* 當(dāng)刪除子視圖的時(shí)候是會(huì)調(diào)用的

• 打印View所有子視圖

po [[self view]recursiveDescription]

• Setting Bundle(編輯設(shè)置頁(yè)面)

http://blog.csdn.net/nogodoss/article/details/21938771

• IOS 后臺(tái)掛起程序 當(dāng)程序到后臺(tái)后，繼續(xù)完成Long-Running Task 任務(wù)

http://sishuok.com/forum/blogPost/list/8393.html

• 設(shè)置Label的行間距

-（void）test{
    NSMutableAttributedString *attributedString =    
   [[NSMutableAttributedString alloc] initWithString:self.contentLabel.text];
    NSMutableParagraphStyle *paragraphStyle =  [[NSMutableParagraphStyle alloc] init];  
   [paragraphStyle setLineSpacing:3];

    //調(diào)整行間距       
   [attributedString addAttribute:NSParagraphStyleAttributeName 
                         value:paragraphStyle 
                         range:NSMakeRange(0, [self.contentLabel.text length])];
     self.contentLabel.attributedText = attributedString;
}

• iOS 開(kāi)發(fā)中一些相關(guān)的路徑

模擬器的位置:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs 

文檔安裝位置:
/Applications/Xcode.app/Contents/Developer/Documentation/DocSets

插件保存路徑:
~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins

自定義代碼段的保存路徑:
~/Library/Developer/Xcode/UserData/CodeSnippets/ 
如果找不到CodeSnippets文件夾，可以自己新建一個(gè)CodeSnippets文件夾。

證書(shū)路徑
~/Library/MobileDevice/Provisioning Profiles