#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    [self test1];    }-(void)test1{    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    [button setTitle:@"按钮" forState:UIControlStateNormal];    button.backgroundColor = [UIColor colorWithRed:0 green:1 blue:1 alpha:0.8];    button.layer.borderColor = [UIColor brownColor].CGColor;    button.layer.borderWidth = 2;    [self.view addSubview:button];    //禁止自动转换AutoresizingMask    button.translatesAutoresizingMaskIntoConstraints = NO;        UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem];    [button1 setTitle:@"按钮1" forState:UIControlStateNormal];    button1.backgroundColor = [UIColor colorWithRed:0 green:1 blue:1 alpha:0.8];    button1.layer.borderColor = [UIColor brownColor].CGColor;    button1.layer.borderWidth = 2;    [self.view addSubview:button1];    button1.translatesAutoresizingMaskIntoConstraints = NO;    //创建布局约束    NSArray *constraints1 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-100-[button]-100-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(button)];    NSArray *constraints2 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-100-[button]-30-[button1(button)]-100-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(button,button1)];    NSArray *constraints3 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-100-[button1]-100-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(button1)];        [self.view addConstraints:constraints1];    [self.view addConstraints:constraints2];    [self.view addConstraints:constraints3];    }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end