#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIView *redView = [[UIView alloc] init];
redView.backgroundColor = [UIColor redColor];
//修正默认约束转换
redView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:redView];
//VFL表达式
NSString *redViewH = @"H:|-20-[redView]-20-|";
NSString *redViewV = @"V:[redView(40)]-10-|";
//字典集
NSDictionary *dict = @{@"redView":redView};
//设置layoutContraints约束
//kNilOptions -> 空枚举选项
NSArray *arrH = [NSLayoutConstraint constraintsWithVisualFormat:redViewH options:kNilOptions metrics:nil views:dict];
[self.view addConstraints:arrH];
NSArray *arrV = [NSLayoutConstraint constraintsWithVisualFormat:redViewV options:kNilOptions metrics:nil views:dict];
[self.view addConstraints:arrV];
}
@end
VFL测试[了解]
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转载自blog.csdn.net/u014268482/article/details/80905745
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