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允许在桥接的view.xib中指定file‘s owner （merge from rush）
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| // | ||
| // XXNibBridge.h | ||
| // | ||
| // Created by sunnyxx on 14-7-2. | ||
| // Copyright (c) 2014 sunnyxx. All rights reserved. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
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| @interface NSObject (XXIBLoadingConvenient) | ||
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| /// For convinent, using class name for identifier in IB. | ||
| /// etc cell reuse id, storyboard id | ||
| + (NSString *)xx_nibID; | ||
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| /// UINib object with same name from main bundle | ||
| + (UINib *)xx_nib; | ||
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| /// Load object of this class from IB file with SAME name | ||
| + (id)xx_loadFromNibWithOwner:(id)owner; | ||
| + (id)xx_loadFromNib; // Nil owner | ||
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| /// Load UIViewController of this class from given storyboard name | ||
| + (id/*UIViewController*/)xx_loadFromStoryboardNamed:(NSString *)name; | ||
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| @end | ||
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| @interface UIView (XXNibBridge) | ||
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| /// Subclass override it to switch On/Off IB bridging. | ||
| /// default -> NO | ||
| + (BOOL)xx_shouldApplyNibBridging; | ||
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| + (Class)xx_ownerClass; | ||
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| - (id)owner; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| // | ||
| // XXNibBridge.m | ||
| // | ||
| // Created by sunnyxx on 14-7-2. | ||
| // Copyright (c) 2014 sunnyxx. All rights reserved. | ||
| // | ||
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| #import "XXNibBridge.h" | ||
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| @implementation NSObject (XXNibLoading) | ||
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| + (NSString *)xx_nibID | ||
| { | ||
| return NSStringFromClass(self); | ||
| } | ||
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| + (id)xx_loadFromNibWithOwner:(id)owner | ||
| { | ||
| NSArray *objects = [[self xx_nib] instantiateWithOwner:owner options:nil]; | ||
| for (UIView *obj in objects) | ||
| { | ||
| if ([obj isMemberOfClass:self]) | ||
| { | ||
| return obj; | ||
| } | ||
| } | ||
| return nil; | ||
| } | ||
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| + (id)xx_loadFromNib | ||
| { | ||
| return [self xx_loadFromNibWithOwner:nil]; | ||
| } | ||
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| + (id)xx_loadFromStoryboardNamed:(NSString *)name | ||
| { | ||
| UIStoryboard *sb = [UIStoryboard storyboardWithName:name bundle:nil]; | ||
| return [sb instantiateViewControllerWithIdentifier:[self xx_nibID]]; | ||
| } | ||
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| + (UINib *)xx_nib | ||
| { | ||
| return [UINib nibWithNibName:[self xx_nibID] bundle:nil]; | ||
| } | ||
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| @end | ||
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| // Mapping flags that whether a class has been replaced | ||
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| static NSMutableDictionary * getIBReplaceFlagMapping() | ||
| { | ||
| static NSMutableDictionary *mapping = nil; | ||
| if (!mapping) | ||
| { | ||
| mapping = [NSMutableDictionary dictionary]; | ||
| } | ||
| return mapping; | ||
| } | ||
|
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| static BOOL getIBReplaceFlag(Class cls) | ||
| { | ||
| NSMutableDictionary *mapping = getIBReplaceFlagMapping(); | ||
| BOOL flag = [mapping[NSStringFromClass(cls)] boolValue]; | ||
| return flag; | ||
| } | ||
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| static void setIBReplaceFlag(Class cls, BOOL flag) | ||
| { | ||
| NSMutableDictionary *mapping = getIBReplaceFlagMapping(); | ||
| mapping[NSStringFromClass(cls)] = @(flag); | ||
| } | ||
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| @import ObjectiveC; | ||
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| char *const kXXNibOwnerKey = "owner"; | ||
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| @implementation UIView (XXNibBridge) | ||
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| + (BOOL)xx_shouldApplyNibBridging | ||
| { | ||
| return NO; | ||
| } | ||
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| + (Class)xx_ownerClass | ||
| { | ||
| return nil; | ||
| } | ||
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| - (id)owner | ||
| { | ||
| return objc_getAssociatedObject(self, kXXNibOwnerKey); | ||
| } | ||
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| - (id)awakeAfterUsingCoder:(NSCoder *)aDecoder | ||
| { | ||
| self = [super awakeAfterUsingCoder:aDecoder]; | ||
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| if (![[self class] xx_shouldApplyNibBridging]) | ||
| { | ||
| return self; | ||
| } | ||
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| // self will be replaced by object created from nib | ||
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| if (!getIBReplaceFlag([self class])) | ||
| { | ||
| setIBReplaceFlag([self class], YES); | ||
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| Class ownerClass = [[self class] xx_ownerClass]; | ||
| id owner; | ||
| if (ownerClass) { | ||
| owner = [[ownerClass alloc] initWithCoder:aDecoder]; | ||
| } | ||
| // Require nib name is equal to class name | ||
| UIView *view = [[self class] xx_loadFromNibWithOwner:owner]; | ||
|
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| objc_setAssociatedObject(view, kXXNibOwnerKey, owner, OBJC_ASSOCIATION_RETAIN_NONATOMIC); | ||
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| NSAssert(view, @"View of class [%@] could not load from nib, check whether the view in nib binds the correct class", [[self class] xx_nibID]); | ||
|
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| view.frame = self.frame; | ||
| view.autoresizingMask = self.autoresizingMask; | ||
| view.hidden = self.hidden; | ||
|
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| // Autolayout support | ||
| if ([view respondsToSelector:@selector(translatesAutoresizingMaskIntoConstraints)]) | ||
| { | ||
| view.translatesAutoresizingMaskIntoConstraints = NO; | ||
| } | ||
|
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| // Autolayout constrains replacing | ||
| // Replace all constrains from `placeholder(self)` view to `real` view | ||
| if ([view respondsToSelector:@selector(constraints)] && self.constraints.count > 0) | ||
| { | ||
| [self replaceAutolayoutConstrainsFromView:self toView:view]; | ||
| } | ||
|
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| return view; | ||
| } | ||
|
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| // Reset flag | ||
| setIBReplaceFlag([self class], NO); | ||
|
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| return self; | ||
| } | ||
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| - (void)replaceAutolayoutConstrainsFromView:(UIView *)placeholderView toView:(UIView *)realView | ||
| { | ||
| // We only need to copy `self` constraints (like width/height constraints) | ||
| // from placeholder to real view | ||
| for (NSLayoutConstraint *constraint in placeholderView.constraints) | ||
| { | ||
| NSLayoutConstraint* newConstraint = [NSLayoutConstraint constraintWithItem:realView | ||
| attribute:constraint.firstAttribute | ||
| relatedBy:constraint.relation | ||
| toItem:nil // Only first item | ||
| attribute:constraint.secondAttribute | ||
| multiplier:constraint.multiplier | ||
| constant:constraint.constant]; | ||
| newConstraint.shouldBeArchived = constraint.shouldBeArchived; | ||
| newConstraint.priority = constraint.priority; | ||
| [realView addConstraint:newConstraint]; | ||
| } | ||
| } | ||
| @end |