访问系统相册并调用图片

//

//  ViewController.m

//访问系统相册

//

//  Created by lanou on 16/7/12.

//  Copyright © 2016年lanou. All rights reserved.

//

#import"ViewController.h"

//遵守协议

@interfaceViewController()

@property(nonatomic,strong)UIButton*userBtn;

@end

@implementationViewController

- (void)viewDidLoad {

[superviewDidLoad];

//所有的能看到的UI控件创建初始化方式都可以采用alloc initWithFrane

self.userBtn=[[UIButtonalloc]initWithFrame:CGRectMake(30,60,80,80)];

//设置颜色

self.userBtn.backgroundColor=[UIColorredColor];

//设置圆形半径

self.userBtn.layer.cornerRadius=40;

self.userBtn.layer.masksToBounds=YES;

//添加点击事件：去访问系统相册

[self.userBtnaddTarget:selfaction:@selector(setUserImage)forControlEvents:(UIControlEventTouchUpInside)];

//将按钮添加到屏幕上来

[self.viewaddSubview:self.userBtn];

}

-(void)setUserImage

{

UIImagePickerController*imagePicker=[[UIImagePickerControlleralloc]init];

//设置代理，到@interface后面遵守协议

imagePicker.delegate=self;

//弹出系统相册

[selfpresentViewController:imagePickeranimated:YEScompletion:nil];

}

//这个方法是协议UIImagePickerControllerDelegate里面的，选择图片结束时候就会自动调用

- (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingImage:(UIImage*)image editingInfo:(nullableNSDictionary *)editingInfo

{

//设置头像

[self.userBtnsetBackgroundImage:imageforState:(UIControlStateNormal)];

//将相册消失掉

[pickerdismissViewControllerAnimated:YEScompletion:nil];

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end