AnchorPoint test

ViewController.m

//
//  ViewController.m
//  AnchorPointTest
//
//  Created by gadmyth on 7/10/17.
//  Copyright © 2017 39sports. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property (strong, nonatomic) UITextField *t1;
@property (strong, nonatomic) UITextField *t2;
@property (strong, nonatomic) CALayer *mLayer;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _t1 = [[UITextField alloc] initWithFrame:CGRectMake(10, 70, 100, 40)];
    _t1.borderStyle = UITextBorderStyleRoundedRect;
    _t1.placeholder = @"请输入0~1内值";
    _t2 = [[UITextField alloc] initWithFrame:CGRectMake(120, 70, 100, 40)];
    _t2.borderStyle = UITextBorderStyleRoundedRect;
    _t2.placeholder = @"请输入0~1内值";
    [self.view addSubview:_t1];
    [self.view addSubview:_t2];
    
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 120, 60, 40)];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [button setTitle:@"确定" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(anchorPointChanged:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
    
    _mLayer = [CALayer layer];
    _mLayer.backgroundColor = [[UIColor alloc] initWithRed:0.7 green:0.1 blue:0.3 alpha:0.5].CGColor;
    _mLayer.frame = CGRectMake(20, 200, 100, 100);
    [self.view.layer addSublayer:_mLayer];
}

- (void)anchorPointChanged:(UIControl *)sender {
    CGFloat x = [_t1.text floatValue];
    CGFloat y = [_t2.text floatValue];
    
    _mLayer.anchorPoint = CGPointMake(x, y);
    
    CGFloat anchorX = _mLayer.bounds.origin.x + x * _mLayer.bounds.size.width;
    CGFloat anchorY = _mLayer.bounds.origin.y + y * _mLayer.bounds.size.height;
    
    CGPoint anchorP = CGPointMake(anchorX, anchorY);
    CGPoint anchorInSuper = [_mLayer convertPoint:anchorP toLayer:self.view.layer];
    NSLog(@"assert the anchorPoint and Position: %@", @(CGPointEqualToPoint(_mLayer.position, anchorInSuper)));
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end