下午上了访问系统相册
圆形的头像半径是宽度的一半
注意设置代理，到@interface后面遵守协议
而且所有的能看得到的UI控件创建初始化呢方式都可以采用alloc initWithFrame
//
//ViewController.m
//访问系统相册
//
//Created bylanouhn on 16/7/12.
//Copyright©2016年lanouhn.
All rights reserved.
//
#import"ViewController.h"
//遵守协议
@interfaceViewController()
@property(nonatomic,strong)UIButton*userbtn;
@end
@implementationViewController
- (void)viewDidLoad{
[superviewDidLoad];
//所有的能看得到的UI控件创建初始化呢方式都可以采用alloc initWithFrame
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];
}
//访问系统相册
-(void)setUserImage
{
UIImagePickerController*imagePicker = [[UIImagePickerControlleralloc]init];
//设置代理，到@interface后面遵守协议
UIImagePickerControllerDelegate>
imagePicker.delegate=self;
//弹出系统相册
[selfpresentViewController:imagePickeranimated:YEScompletion:nil];
}
//这个方法是协议UIImagePickerControllerDelegate里面的，选择图片结束的时候就会自动调用
- (void)imagePickerController:(UIImagePickerController*)picker
didFinishPickingImage:(UIImage*)image
editingInfo:(nullableNSDictionary *)editingInfo
{
//设置头像
[self.userbtnsetBackgroundImage:imageforState:(UIControlStateNormal)];
//将系统相册消失掉
[picker
dismissViewControllerAnimated:YEScompletion:nil];
}
- (void)didReceiveMemoryWarning{
[superdidReceiveMemoryWarning];
// Dispose
of any resources that can be recreated.
}
@end
