Masonry是用代码实现自动布局的第三方框架。

使用之前首先要导入框架，以下是具体的代码实现。

1.中心点与父视图相同

#import "ViewController.h"  #import "Masonry.h"  @interface ViewController ()    @end    @implementation ViewController    - (void)viewDidLoad {      [super viewDidLoad];    //    [self setView1];    //    [self setView2];        //[self setView3];       [self setView4];    }  /**   *  中心点与父视图相同   */  -(void)setView1{      UIView *mainView = [[UIView alloc] init];      mainView.backgroundColor = [UIColor redColor];      [self.view addSubview:mainView];      [mainView mas_makeConstraints:^(MASConstraintMaker *make) {          make.center.equalTo(self.view);          make.size.mas_equalTo(CGSizeMake(200, 200));      }];  }

2.距离上下左右边距

/**   *  距离上下左右边距   */  -(void)setView2{      UIView *mainView = [[UIView alloc] init];      mainView.backgroundColor = [UIColor redColor];      [self.view addSubview:mainView];      [mainView mas_makeConstraints:^(MASConstraintMaker *make) {          //make.edges.equalTo(self.view).with.insets(UIEdgeInsetsMake(100, 80, 50, 10));          make.left.equalTo(self.view).with.offset(10);          make.right.equalTo(self.view).with.offset(-20);          make.top.equalTo(self.view).with.offset(30);          make.bottom.equalTo(self.view).with.offset(-40);      }];

3.两个视图左右排开间距是10

-(void)setView3{      //左边视图      UIView *rightView = [[UIView alloc] init];      rightView.backgroundColor = [UIColor redColor];      [self.view addSubview:rightView];      //右边视图      UIView *leftView1 = [[UIView alloc] init];      leftView1.backgroundColor = [UIColor greenColor];      [self.view addSubview:leftView1];         [rightView mas_makeConstraints:^(MASConstraintMaker *make) {       make.centerY.mas_equalTo(self.view.mas_centerY);       make.height.mas_equalTo(150);       make.width.mas_equalTo(leftView1.mas_width);       make.left.mas_equalTo(self.view.mas_left).with.offset(10);       make.right.mas_equalTo(leftView1.mas_left).with.offset(-10);   }];   [leftView1 mas_makeConstraints:^(MASConstraintMaker *make) {          make.centerY.mas_equalTo(self.view.mas_centerY);          make.height.mas_equalTo(150);          make.width.mas_equalTo(rightView.mas_width);          make.left.mas_equalTo(rightView.mas_right).with.offset(10);          make.right.mas_equalTo(self.view.mas_right).with.offset(-10);      }];  }

4.登录界面

-(void)setView4{      UITextField *accountTextField = [[UITextField alloc] init];      accountTextField.backgroundColor = [UIColor redColor];      accountTextField.placeholder = @"账号";      [self.view addSubview:accountTextField];            UITextField *secretTextField = [[UITextField alloc] init];      secretTextField.backgroundColor = [UIColor greenColor];      secretTextField.placeholder = @"密码";      [self.view addSubview:secretTextField];      UIButton *loginButton = [[UIButton alloc] init];      loginButton.backgroundColor = [UIColor blueColor];      [loginButton setTitle:@"登录" forState:UIControlStateNormal];      [self.view addSubview:loginButton];      [accountTextField mas_makeConstraints:^(MASConstraintMaker *make) {          make.left.equalTo(self.view.mas_left).offset(50);          make.right.equalTo(self.view.mas_right).offset(-50);          make.top.equalTo(self.view.mas_top).offset(100);          make.height.mas_equalTo(50);      }];      [secretTextField mas_makeConstraints:^(MASConstraintMaker *make) {          make.left.equalTo(self.view.mas_left).offset(50);          make.right.equalTo(self.view.mas_right).offset(-50);          make.top.equalTo(accountTextField.mas_bottom).offset(40);          make.height.mas_equalTo(50);      }];      [loginButton mas_makeConstraints:^(MASConstraintMaker *make) {          make.left.equalTo(self.view.mas_left).offset(100);          make.right.equalTo(self.view.mas_right).offset(-100);          make.top.equalTo(secretTextField.mas_bottom).offset(40);          make.height.mas_equalTo(50);      }];        }

以下为源码连接地址：http://pan.baidu.com/s/1eRnfs8i