MrBoog

// override : layoutSubviews
- (void)layoutSubviews

{
    
    [super layoutSubviews];
    
    self.backgroundColor = [UIColor clearColor];
    
    for (UIView *subview in self.subviews) {

MrBoog

//iOS7 

#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)

#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)

MrBoog

标志	值	含义
NULL	(void *)0	C指针的字面零值
nil	(id)0	Objective-C对象的字面零值
Nil	(Class)0	Objective-C类的字面零值
NSNull	[NSNull null]	用来表示零值的单独的对象

MrBoog

import Foundation


fileprivate let tabBarItemTag: Int = 10090
extension UITabBar {
    public func addItemBadge(atIndex index: Int) {
        guard let itemCount = self.items?.count, itemCount > 0 else {
            return

MrBoog

#!/usr/bin/swift

import Foundation

func backup() {
    let args = CommandLine.arguments
    guard args.count > 1 else {
        return print("Backup Failed! : \n    Detail: Missing commit message whick should be surrounded by quotation mark.")
    }
    let arg = args[1]