直接修改UIView的x,y,width,height...

来源：互联网发布：保山学院网络教学平台编辑：程序博客网时间：2024/05/16 19:08

在iOS开发中，我们常常需要修改一个一个控件的x,y,width,height…但是OC的语法不允许我们直接修改结构体中的成员变量，我们往往需要先取出控件的frame或者是bounds或者是center，然后进行相应地修改，再次将frame,bounds,center赋值。这样显得比较繁琐。那我们怎么做到能够直接修改UIView的x,y,width,height呢？我们知道所有的控件（我们直接或者说是常用的控件都是继承自UIView），而iOS开发中允许我们给系统的类写分类，这样我们就可以写相应地分类来解决这个问题。
首先我们建议一个名为Layout的UIView的分类。代码如下：

UIView + Layout.h

#import <UIKit/UIKit.h>@interface UIView (Layout)@property (nonatomic,assign) float top;@property (nonatomic,assign) float bottom;@property (nonatomic,assign) float left;@property (nonatomic,assign) float right;@property (nonatomic,assign) float x;@property (nonatomic,assign) float y;@property (nonatomic,assign) float widht;@property (nonatomic,assign) float heiht;@property (nonatomic,assign) float centerX;@property (nonatomic,assign) float centerY;@property (nonatomic,assign) CGPoint origin;@property (nonatomic,assign) CGSize size;@end

UIView + Layout.m

#import "UIView+Layout.h"@implementation UIView (Layout)- (float)top{    return self.frame.origin.y;}- (void)setTop:(float)top{    CGRect frame = self.frame;    frame.origin.y = top;    self.frame = frame;}- (float)bottom{    return self.frame.origin.y + self.frame.size.height;}- (void)setBottom:(float)bottom{    CGRect frame = self.frame;    frame.origin.y = bottom - self.frame.size.height;    self.frame = frame;}- (float)left{    return self.frame.origin.x;}- (void)setLeft:(float)left{    CGRect frame = self.frame;    frame.origin.x = left;    self.frame = frame;}- (float)right{    return self.frame.origin.y + self.frame.size.width;}- (void)setRight:(float)right{    CGRect frame = self.frame;    frame.origin.x = right - self.frame.size.width;    self.frame = frame;}- (float)x{    return self.frame.origin.x;}- (void)setX:(float)x{    CGRect frame = self.frame;    frame.origin.x = x;    self.frame = frame;}- (float)y{    return self.frame.origin.y;}- (void)setY:(float)y{    CGRect frame = self.frame;    frame.origin.y = y;    self.frame = frame;}- (float)widht{    return self.frame.size.width;}- (void)setWidht:(float)widht{    CGRect frame = self.frame;    frame.size.width = widht;    self.frame = frame;}- (float)heiht{    return self.frame.size.height;}- (void)setHeiht:(float)heiht{    CGRect frame = self.frame;    frame.size.height= heiht;    self.frame = frame;}- (float)centerX{    return self.center.x;}- (void)setCenterX:(float)centerX{    CGPoint center = self.center;    center.x = centerX;    self.center = center;}- (float)centerY{    return self.center.y;}- (void)setCenterY:(float)centerY{    CGPoint center = self.center;    center.y = centerY;    self.center = center;}- (CGSize)size{    return self.frame.size;}- (void)setSize:(CGSize)size{    CGRect frame = self.frame;    frame.size = size;    self.frame = frame;}- (CGPoint)origin{    return self.frame.origin;}- (void)setOrigin:(CGPoint)origin{    CGRect frame = self.frame;    frame.origin= origin;    self.frame = frame;}@end

这样，使用起来就十分方便了，我写了一个小程序，需要看看的请点击这里。

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