框架

SDWebImage 加载图片

Reachability 监测联网状态

SSKeyChain 钥匙串

SSZipArchive 压缩、解压缩zip、unzip  //如出错，需要加载解压缩依赖的动态库libz.dylib或libz最新版本

AFNetworking 网络

OBShapedButton 判断按钮部分是否透明

__weak typeof(self) weakSelf = self;

iOS、OS X 都支持CoreGraphics, QuartzCore。

UIKit只支持iOS。

CALayer在QuartsCore框架中

CGImageRef、CGColorRef在CoreGraphics

UIImage、UIColor在UIKit。

1. ceil() 向上取整

//Test ceil() 向上取整

cout << "Test ceil() 向上取整!" << endl;

cout << "ceil 1.2 = " << ceil(1.2) << endl;      //2

cout << "ceil 1.8 = " << ceil(1.8) << endl;      //2

cout << "ceil -1.2 = " << ceil(-1.2) << endl;    //-1

cout << "ceil -1.8 = " << ceil(-1.8) << endl;    //-1

cout << "ceil 0.0 = " << ceil(0.0) << endl;      //0

cout << endl;

2. floor() 向下取整

//Test floor() 向下取整

cout << "Test floor() 向下取整!" << endl;

cout << "floor 1.2 = " << floor(1.2) << endl;    //1

cout << "floor 1.8 = " << floor(1.8) << endl;    //1

cout << "floor -1.2 = " << floor(-1.2) << endl; //-2

cout << "floor -1.8 = " << floor(-1.8) << endl; //-2

cout << "floor 0.0 = " << floor(0.0) << endl;    //0

cout << endl;

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