1.在mac终端内，使用brew安装opencv3，这时我的opencv被安装到/usr/local/Cellar/opencv3/3.2.0内。
2.新建xcode 项目，选择command line tool，在项目目录内新建一个group，把/usr/local/Cellar/opencv3/3.2.0/lib内的含有libopencv的dylib都添加进去。
3.在build settings 内更改Header Search Paths为/usr/local/Cellar/opencv3/3.2.0/include, Library Search Paths 更为/usr/local/Cellar/opencv3/3.2.0/lib。注意此处不能copy网上仅仅是/usr/local/include 或者/usr/local/lib，要根据你opencv安装地址而定
4.在main函数中输入，即可显示出图片，注意图片的路径要正确，自己定。
p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #d12f1b }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000; min-height: 13.0px }
p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #78492a }
p.p4 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ba2da2 }
p.p5 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000 }
p.p6 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400 }
span.s1 { color: #78492a }
span.s2 { }
span.s3 { color: #d12f1b }
span.s4 { color: #000000 }
span.s5 { color: #703daa }
span.s6 { color: #ba2da2 }
span.s7 { color: #3e1e81 }
span.s8 { color: #272ad8 }
span.s9 { color: #008400 }
#include "opencv2/core.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include <iostream>
#include <string>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
String imageName("/Users/mac-jcc/Desktop/opencv-00/jcc.png");
Mat image;
image = imread(imageName, IMREAD_COLOR);
if(image.empty())
{
cout<<"could not open or find the image"<<std::endl;
return -1;
}
namedWindow( "Display window", WINDOW_AUTOSIZE );
imshow( "Display window"，image );
waitKey(0);
return 0;
}