版本記錄
| 版本號 | 時間 |
|---|---|
| V1.0 | 2018.03.26 |
前言
iOS圈內(nèi)有幾個人大家基本都知道支鸡，比如說王巍鼠渺、唐巧湾盗，還有YYKit框架的作者現(xiàn)任職于滴滴的郭曜源 - ibireme等意敛。這里有一篇唐巧對他的專訪馅巷，還有他的 GitHub - Yaoyuan 和 博客，這里貼出來框架YYKit 框架草姻。接下來幾篇我們就一起來看一下這個框架钓猬。感興趣的可以看上面寫的幾篇。
1. YYKit源碼探究（一） —— 基本概覽
2. YYKit源碼探究（二） —— NSString分類之Hash（一）
3. YYKit源碼探究（三） —— NSString分類之Encode and decode（二）
4. YYKit源碼探究（四） —— NSString分類之Drawing（三）
5. YYKit源碼探究（五） —— NSString分類之Regular Expression（四）
6. YYKit源碼探究（六） —— NSString分類之NSNumber Compatible（五）
7. YYKit源碼探究（七） —— NSString分類之Utilities（六）
8. YYKit源碼探究（八） —— NSNumber分類（一）
9. YYKit源碼探究（九） —— UIFont分類之架構(gòu)分析和Font Traits（一）
10. YYKit源碼探究（十） —— UIFont分類之Create font（二）
11. YYKit源碼探究（十一） —— UIFont分類之Load and unload font（三）
12. YYKit源碼探究（十二） —— UIFont分類之Dump font data（四）
13. YYKit源碼探究（十三） —— UIImage分類之框架結(jié)構(gòu)和Create image部分（一）
14. YYKit源碼探究（十四） —— UIImage分類之Image Info（二）
15. YYKit源碼探究（十五） —— UIImage分類之Modify Image（三）
16. YYKit源碼探究（十六） —— UIImage分類之Image Effect（四）
17. YYKit源碼探究（十七） —— UIImageView分類之架構(gòu)和image部分（一）
18. YYKit源碼探究（十八） —— UIImageView分類之highlight image部分（二）
19. YYKit源碼探究（十九） —— UIScreen分類（一）
20. YYKit源碼探究（二十） —— UIScrollView分類（一）
21. YYKit源碼探究（二十一） —— UITableView分類（一）
22. YYKit源碼探究（二十二） —— UITextField分類（一）
回顧
上一篇主要介紹了UITextField分類撩独，這一篇主要看一下UIView部分敞曹。
API
下面我們看一下API账月。
/**
Create a snapshot image of the complete view hierarchy.
*/
- (nullable UIImage *)snapshotImage;
/**
Create a snapshot image of the complete view hierarchy.
@discussion It's faster than "snapshotImage", but may cause screen updates.
See -[UIView drawViewHierarchyInRect:afterScreenUpdates:] for more information.
*/
- (nullable UIImage *)snapshotImageAfterScreenUpdates:(BOOL)afterUpdates;
/**
Create a snapshot PDF of the complete view hierarchy.
*/
- (nullable NSData *)snapshotPDF;
/**
Shortcut to set the view.layer's shadow
@param color Shadow Color
@param offset Shadow offset
@param radius Shadow radius
*/
- (void)setLayerShadow:(nullable UIColor*)color offset:(CGSize)offset radius:(CGFloat)radius;
/**
Remove all subviews.
@warning Never call this method inside your view's drawRect: method.
*/
- (void)removeAllSubviews;
/**
Returns the view's view controller (may be nil).
*/
@property (nullable, nonatomic, readonly) UIViewController *viewController;
/**
Returns the visible alpha on screen, taking into account superview and window.
*/
@property (nonatomic, readonly) CGFloat visibleAlpha;
/**
Converts a point from the receiver's coordinate system to that of the specified view or window.
@param point A point specified in the local coordinate system (bounds) of the receiver.
@param view The view or window into whose coordinate system point is to be converted.
If view is nil, this method instead converts to window base coordinates.
@return The point converted to the coordinate system of view.
*/
- (CGPoint)convertPoint:(CGPoint)point toViewOrWindow:(nullable UIView *)view;
/**
Converts a point from the coordinate system of a given view or window to that of the receiver.
@param point A point specified in the local coordinate system (bounds) of view.
@param view The view or window with point in its coordinate system.
If view is nil, this method instead converts from window base coordinates.
@return The point converted to the local coordinate system (bounds) of the receiver.
*/
- (CGPoint)convertPoint:(CGPoint)point fromViewOrWindow:(nullable UIView *)view;
/**
Converts a rectangle from the receiver's coordinate system to that of another view or window.
@param rect A rectangle specified in the local coordinate system (bounds) of the receiver.
@param view The view or window that is the target of the conversion operation. If view is nil, this method instead converts to window base coordinates.
@return The converted rectangle.
*/
- (CGRect)convertRect:(CGRect)rect toViewOrWindow:(nullable UIView *)view;
/**
Converts a rectangle from the coordinate system of another view or window to that of the receiver.
@param rect A rectangle specified in the local coordinate system (bounds) of view.
@param view The view or window with rect in its coordinate system.
If view is nil, this method instead converts from window base coordinates.
@return The converted rectangle.
*/
- (CGRect)convertRect:(CGRect)rect fromViewOrWindow:(nullable UIView *)view;
@property (nonatomic) CGFloat left; ///< Shortcut for frame.origin.x.
@property (nonatomic) CGFloat top; ///< Shortcut for frame.origin.y
@property (nonatomic) CGFloat right; ///< Shortcut for frame.origin.x + frame.size.width
@property (nonatomic) CGFloat bottom; ///< Shortcut for frame.origin.y + frame.size.height
@property (nonatomic) CGFloat width; ///< Shortcut for frame.size.width.
@property (nonatomic) CGFloat height; ///< Shortcut for frame.size.height.
@property (nonatomic) CGFloat centerX; ///< Shortcut for center.x
@property (nonatomic) CGFloat centerY; ///< Shortcut for center.y
@property (nonatomic) CGPoint origin; ///< Shortcut for frame.origin.
@property (nonatomic) CGSize size; ///< Shortcut for frame.size.
下面我們就看一下該API文檔。
1. - (nullable UIImage *)snapshotImage;
該方法的作用就是創(chuàng)建完整視圖層次結(jié)構(gòu)的快照映像澳迫。
方法實現(xiàn)
- (UIImage *)snapshotImage {
UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, 0);
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *snap = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return snap;
}
2. - (nullable UIImage *)snapshotImageAfterScreenUpdates:(BOOL)afterUpdates;
該方法的作用就是創(chuàng)建完整視圖層次結(jié)構(gòu)的快照映像局齿。它比snapshotImage快，但可能導(dǎo)致屏幕更新橄登。
有關(guān)更多信息抓歼，請參閱- [UIView drawViewHierarchyInRect：afterScreenUpdates：]。
方法實現(xiàn)
下面看一下方法實現(xiàn)拢锹。
- (UIImage *)snapshotImageAfterScreenUpdates:(BOOL)afterUpdates {
if (![self respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
return [self snapshotImage];
}
UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, 0);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:afterUpdates];
UIImage *snap = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return snap;
}
3. - (nullable NSData *)snapshotPDF;
該方法的作用是創(chuàng)建完整視圖層次結(jié)構(gòu)的快照PDF谣妻。
方法實現(xiàn)
- (NSData *)snapshotPDF {
CGRect bounds = self.bounds;
NSMutableData *data = [NSMutableData data];
CGDataConsumerRef consumer = CGDataConsumerCreateWithCFData((__bridge CFMutableDataRef)data);
CGContextRef context = CGPDFContextCreate(consumer, &bounds, NULL);
CGDataConsumerRelease(consumer);
if (!context) return nil;
CGPDFContextBeginPage(context, NULL);
CGContextTranslateCTM(context, 0, bounds.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
[self.layer renderInContext:context];
CGPDFContextEndPage(context);
CGPDFContextClose(context);
CGContextRelease(context);
return data;
}
4. - (void)setLayerShadow:(nullable UIColor*)color offset:(CGSize)offset radius:(CGFloat)radius;
該方法的作用就是設(shè)置layer的陰影。
方法實現(xiàn)
下面看一下方法實現(xiàn)卒稳。
- (void)setLayerShadow:(UIColor*)color offset:(CGSize)offset radius:(CGFloat)radius {
self.layer.shadowColor = color.CGColor;
self.layer.shadowOffset = offset;
self.layer.shadowRadius = radius;
self.layer.shadowOpacity = 1;
self.layer.shouldRasterize = YES;
self.layer.rasterizationScale = [UIScreen mainScreen].scale;
}
5. - (void)removeAllSubviews;
該方法的作用就是移除所有子視圖蹋半。
注意：不要在
view的drawRect:方法里面調(diào)用這個方法。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)充坑。
- (void)removeAllSubviews {
//[self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
while (self.subviews.count) {
[self.subviews.lastObject removeFromSuperview];
}
}
6. @property (nullable, nonatomic, readonly) UIViewController *viewController;
該屬性的作用就是獲取view的viewController减江，可能為nil。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)匪傍。
- (UIViewController *)viewController {
for (UIView *view = self; view; view = view.superview) {
UIResponder *nextResponder = [view nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return (UIViewController *)nextResponder;
}
}
return nil;
}
7. @property (nonatomic, readonly) CGFloat visibleAlpha;
該屬性的作用就是考慮到父視圖和window您市，返回屏幕上的可見alpha。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)役衡。
- (CGFloat)visibleAlpha {
if ([self isKindOfClass:[UIWindow class]]) {
if (self.hidden) return 0;
return self.alpha;
}
if (!self.window) return 0;
CGFloat alpha = 1;
UIView *v = self;
while (v) {
if (v.hidden) {
alpha = 0;
break;
}
alpha *= v.alpha;
v = v.superview;
}
return alpha;
}
8. - (CGPoint)convertPoint:(CGPoint)point toViewOrWindow:(nullable UIView *)view;
該方法的作用就是在兩個視圖上的點的轉(zhuǎn)換茵休。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)。
- (CGPoint)convertPoint:(CGPoint)point toViewOrWindow:(UIView *)view {
if (!view) {
if ([self isKindOfClass:[UIWindow class]]) {
return [((UIWindow *)self) convertPoint:point toWindow:nil];
} else {
return [self convertPoint:point toView:nil];
}
}
UIWindow *from = [self isKindOfClass:[UIWindow class]] ? (id)self : self.window;
UIWindow *to = [view isKindOfClass:[UIWindow class]] ? (id)view : view.window;
if ((!from || !to) || (from == to)) return [self convertPoint:point toView:view];
point = [self convertPoint:point toView:from];
point = [to convertPoint:point fromWindow:from];
point = [view convertPoint:point fromView:to];
return point;
}
9. - (CGPoint)convertPoint:(CGPoint)point fromViewOrWindow:(nullable UIView *)view;
該方法的作用就是在兩個視圖上的點的轉(zhuǎn)換手蝎，與上面那個方法不同的是榕莺，這里是從別的view到receiver的點的轉(zhuǎn)換。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)棵介。
- (CGPoint)convertPoint:(CGPoint)point fromViewOrWindow:(UIView *)view {
if (!view) {
if ([self isKindOfClass:[UIWindow class]]) {
return [((UIWindow *)self) convertPoint:point fromWindow:nil];
} else {
return [self convertPoint:point fromView:nil];
}
}
UIWindow *from = [view isKindOfClass:[UIWindow class]] ? (id)view : view.window;
UIWindow *to = [self isKindOfClass:[UIWindow class]] ? (id)self : self.window;
if ((!from || !to) || (from == to)) return [self convertPoint:point fromView:view];
point = [from convertPoint:point fromView:view];
point = [to convertPoint:point fromWindow:from];
point = [self convertPoint:point fromView:to];
return point;
}
10. - (CGRect)convertRect:(CGRect)rect toViewOrWindow:(nullable UIView *)view;
該方法的作用就是在兩個視圖上的rect的轉(zhuǎn)換钉鸯。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)。
- (CGRect)convertRect:(CGRect)rect toViewOrWindow:(UIView *)view {
if (!view) {
if ([self isKindOfClass:[UIWindow class]]) {
return [((UIWindow *)self) convertRect:rect toWindow:nil];
} else {
return [self convertRect:rect toView:nil];
}
}
UIWindow *from = [self isKindOfClass:[UIWindow class]] ? (id)self : self.window;
UIWindow *to = [view isKindOfClass:[UIWindow class]] ? (id)view : view.window;
if (!from || !to) return [self convertRect:rect toView:view];
if (from == to) return [self convertRect:rect toView:view];
rect = [self convertRect:rect toView:from];
rect = [to convertRect:rect fromWindow:from];
rect = [view convertRect:rect fromView:to];
return rect;
}
11. - (CGRect)convertRect:(CGRect)rect fromViewOrWindow:(nullable UIView *)view;
該方法的作用就是在兩個視圖上的rect的轉(zhuǎn)換邮辽，與上面那個方法不同的是唠雕，這里是從別的view到receiver的rect的轉(zhuǎn)換。
方法實現(xiàn)
下面我們就看一下方法的實現(xiàn)吨述。
- (CGRect)convertRect:(CGRect)rect fromViewOrWindow:(UIView *)view {
if (!view) {
if ([self isKindOfClass:[UIWindow class]]) {
return [((UIWindow *)self) convertRect:rect fromWindow:nil];
} else {
return [self convertRect:rect fromView:nil];
}
}
UIWindow *from = [view isKindOfClass:[UIWindow class]] ? (id)view : view.window;
UIWindow *to = [self isKindOfClass:[UIWindow class]] ? (id)self : self.window;
if ((!from || !to) || (from == to)) return [self convertRect:rect fromView:view];
rect = [from convertRect:rect fromView:view];
rect = [to convertRect:rect fromWindow:from];
rect = [self convertRect:rect fromView:to];
return rect;
}
12. 其他幾個相關(guān)屬性
下面看一下其他幾個相關(guān)屬性岩睁，包括left、bottom揣云、right和top等捕儒。
這里直接給出實現(xiàn)了，很簡單就不多說了。
- (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)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)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);
}
- (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;
}
后記
本篇主要介紹的是
UIView的一個分類刘莹，感興趣的給個贊或者關(guān)注阎毅，謝謝~~~~
