UIView中的坐标转换

好长时间不用,发现对 UIView中的坐标转换已经没有印象了,突然发现自己不会用了,<不对,好像以前也没咋弄懂~~~~~>

下面自己来总结下:

直接看代码输出和解释,是不是一目了然啊~~~~我都懂了,你们看了都会懂啦...嘿嘿!!!

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
    // rightButton的原始坐标
    rightButton.frame = CGRectMake(200, 100, 100, 50);
    [rightButton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
    rightButton.backgroundColor=[UIColor redColor];
    [rightButton setTitle:@"完成" forState:UIControlStateNormal];
    [self.view addSubview:rightButton];
    
    /* 1.将像素point从view中转换到当前视图中，返回在当前视图中的像素值
       输出: point = 0.000000---0.000000
     
    CGPoint point = [rightButton convertPoint:CGPointMake(200, 100) fromView:self.view];
    rightButton.frame = CGRectMake(point.x, point.y, 100, 50);
    NSLog(@"point = %f---%f",point.x,point.y);
     */
    
    /*2.将像素point由point所在视图转换到目标视图view中，返回在目标视图view中的像素值
      输出: point = 300.000000---200.000000
     CGPoint point = [rightButton convertPoint:CGPointMake(100,100) toView:self.view];
     rightButton.frame = CGRectMake(point.x, point.y, 100, 50);
     NSLog(@"point = %f---%f",point.x,point.y);
     */
    
    /*
     3.将rect由rect所在视图转换到目标视图view中，返回在目标视图view中的rect
       输出: 220.000000--120.000000--20.000000--20.000000
     
     CGRect rect = [rightButton convertRect:CGRectMake(20, 20, 20, 20) toView:self.view];
     rightButton.frame = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
     NSLog(@"%f--%f--%f--%f",rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
     */
    
    /*
     4.将rect由rect所在视图转换到目标视图view中，返回在目标视图view中的rect
     输出: -180.000000---80.000000--20.000000--20.000000
     */
    
     CGRect rect = [rightButton convertRect:CGRectMake(20, 20, 20, 20) fromView:self.view];
     rightButton.frame = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
     NSLog(@"%f--%f--%f--%f",rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
}

@end

我自己总结记住的就是:

// 将像素point由point所在视图转换到目标视图view中，返回在目标视图view中的像素值

- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;   // 坐标点相加

// 将像素point从view中转换到当前视图中，返回在当前视图中的像素值

- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view;   // 坐标点相减,并且是新坐标点 - 原坐标点

// 将rect由rect所在视图转换到目标视图view中，返回在目标视图view中的rect

- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;        // 坐标点相加,改变原始宽高

// 将rect从view中转换到当前视图中，返回在当前视图中的rect

- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;      // 坐标点相减,并且是新坐标点 - 原坐标点,改变原始宽高