自己以后开始一个新的项目的时候一定要给uiview写一些拓展的协议

@interface UIView (TTCategory)

.m文件的内容

//
// Copyright 2009-2011 Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0 //
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#import "UIViewAdditions.h"

///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Additions.
*/
//TT_FIX_CATEGORY_BUG(UIViewAdditions)

@implementation UIView (TTCategory)

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)left {
return
self.frame.origin.x;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setLeft:(CGFloat)x {
CGRect frame =
self.frame;
frame.origin.x = x;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)top {
return
self.frame.origin.y;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setTop:(CGFloat)y {
CGRect frame =
self.frame;
frame.origin.y = y;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)right {
return
self.frame.origin.x +
self.frame.size.width;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setRight:(CGFloat)right {
CGRect frame =
self.frame;
frame.origin.x = right - frame.size.width;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)bottom {
return
self.frame.origin.y +
self.frame.size.height;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setBottom:(CGFloat)bottom {
CGRect frame =
self.frame;
frame.origin.y = bottom - frame.size.height;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)centerX {
return
self.center.x;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setCenterX:(CGFloat)centerX {
self.center =
CGPointMake(centerX, self.center.y);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)centerY {
return
self.center.y;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setCenterY:(CGFloat)centerY {
self.center =
CGPointMake(self.center.x, centerY);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)width {
return
self.frame.size.width;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setWidth:(CGFloat)width {
CGRect frame =
self.frame;
frame.size.width = width;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)height {
return
self.frame.size.height;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setHeight:(CGFloat)height {
CGRect frame =
self.frame;
frame.size.height = height;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)ttScreenX {
CGFloat x = 0.0f;
for (UIView* view =
self; view; view = view.superview) {
x += view.left;
}
return x;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)ttScreenY {
CGFloat y = 0.0f;
for (UIView* view =
self; view; view = view.superview) {
y += view.top;
}
return y;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)screenViewX {
CGFloat x = 0.0f;
for (UIView* view =
self; view; view = view.superview) {
x += view.left;

if ([view
isKindOfClass:[UIScrollView
class]]) {
UIScrollView* scrollView = (UIScrollView*)view;
x -= scrollView.contentOffset.x;
}
}

return x;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGFloat)screenViewY {
CGFloat y = 0;
for (UIView* view =
self; view; view = view.superview) {
y += view.top;

if ([view
isKindOfClass:[UIScrollView
class]]) {
UIScrollView* scrollView = (UIScrollView*)view;
y -= scrollView.contentOffset.y;
}
}
return y;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGRect)screenFrame {
return
CGRectMake(self.screenViewX,
self.screenViewY,
self.width,
self.height);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGPoint)origin {
return
self.frame.origin;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setOrigin:(CGPoint)origin {
CGRect frame =
self.frame;
frame.origin = origin;
self.frame = frame;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (CGSize)size {
return
self.frame.size;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setSize:(CGSize)size {
CGRect frame =
self.frame;
frame.size = size;
self.frame = frame;
}

@end

.h文件

//
// Copyright 2009-2011 Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0 //
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface UIView (TTCategory)

/**
* Shortcut for frame.origin.x.
*
* Sets frame.origin.x = left
*/
@property (nonatomic)
CGFloat left;

/**
* Shortcut for frame.origin.y
*
* Sets frame.origin.y = top
*/
@property (nonatomic)
CGFloat top;

/**
* Shortcut for frame.origin.x + frame.size.width
*
* Sets frame.origin.x = right - frame.size.width
*/
@property (nonatomic)
CGFloat right;

/**
* Shortcut for frame.origin.y + frame.size.height
*
* Sets frame.origin.y = bottom - frame.size.height
*/
@property (nonatomic)
CGFloat bottom;

/**
* Shortcut for frame.size.width
*
* Sets frame.size.width = width
*/
@property (nonatomic)
CGFloat width;

/**
* Shortcut for frame.size.height
*
* Sets frame.size.height = height
*/
@property (nonatomic)
CGFloat height;

/**
* Shortcut for center.x
*
* Sets center.x = centerX
*/
@property (nonatomic)
CGFloat centerX;

/**
* Shortcut for center.y
*
* Sets center.y = centerY
*/
@property (nonatomic)
CGFloat centerY;

/**
* Return the x coordinate on the screen.
*/
@property (nonatomic,
readonly) CGFloat ttScreenX;

/**
* Return the y coordinate on the screen.
*/
@property (nonatomic,
readonly) CGFloat ttScreenY;

/**
* Return the x coordinate on the screen, taking into account scroll views.
*/
@property (nonatomic,
readonly) CGFloat screenViewX;

/**
* Return the y coordinate on the screen, taking into account scroll views.
*/
@property (nonatomic,
readonly) CGFloat screenViewY;

/**
* Return the view frame on the screen, taking into account scroll views.
*/
@property (nonatomic,
readonly) CGRect screenFrame;

/**
* Shortcut for frame.origin
*/
@property (nonatomic)
CGPoint origin;

/**
* Shortcut for frame.size
*/
@property (nonatomic)
CGSize size;

@end