给按钮添加点击事件
*给UIcontrol加个类别
.h文件中
#import
typedef void(^GCControlEventActionBlock)(UIControl* control, NSSet* touches);
/**
* This Extension is used for add UIControlEvents to the UIControls.
*/
@interface UIControl (GCEvent)
/**
* add actionBlock for paticular event. you can call this method mutiple times for a paticular event.
*
* @param event the particular event.
* @param action action will be invoked when the particular event happen. |action| can't be nil.
*/
- (void)addControlEvents:(UIControlEvents)event action:(GCControlEventActionBlock)action;
/**
* remove all the actionBlocks for paticular event.
*
* @param event the particular event.
*/
- (void)removeAllControlEventsAction:(UIControlEvents)event;
#import "UIControl+GCEvent.h"
#import
@interface UIControlEventBlockWrapper : NSObject
@property (nonatomic, weak) UIControl* control;
@property (nonatomic, assign) UIControlEvents events;
@property (nonatomic, copy) GCControlEventActionBlock eventActionBlock;
- (instancetype)initWithControl:(UIControl *)control
controlEvents:(UIControlEvents)event
eventActionBlock:(GCControlEventActionBlock)eventActionBlock;
@end
@implementation UIControlEventBlockWrapper
- (instancetype)initWithControl:(UIControl *)control
controlEvents:(UIControlEvents)event
eventActionBlock:(GCControlEventActionBlock)eventActionBlock {
if (self = [self init]) {
[control addTarget:self action:@selector(_executeActionBlockByControl:touches:) forControlEvents:event];
_control = control;
_events = event;
_eventActionBlock = eventActionBlock;
}
return self;
}
- (void)_executeActionBlockByControl:(UIControl *)control touches:(id/*UITouchesEvent*/)touches {
id allTouches = nil;
if ([touches respondsToSelector:@selector(allTouches)]) {
allTouches = [touches allTouches];
}
_eventActionBlock(control, allTouches);
}
- (void)dealloc {
[_control removeTarget:self
action:@selector(_executeActionBlockByControl:touches:)
forControlEvents:_events];
}
@end
@implementation UIControl (GCEvent)
- (void)addControlEvents:(UIControlEvents)event action:(GCControlEventActionBlock)action {
NSParameterAssert(action);
/**
* |wrapper| created by using class method will release delay at the end of the
* method which invoke the |removeAllControlEventsAction:|. why??
*/
UIControlEventBlockWrapper* wrapper = [[UIControlEventBlockWrapper alloc]
initWithControl:self
controlEvents:event
eventActionBlock:action];
[[self _controlEventsBlockWrappersForControlEvents:event] addObject:wrapper];
}
- (void)removeAllControlEventsAction:(UIControlEvents)event {
[[self _controlEventsBlockWrappersForControlEvents:event] removeAllObjects];
}
#pragma mark - instance private method
- (NSMutableArray *)_controlEventsBlockWrappersForControlEvents:(UIControlEvents)event {
static char const wrappersDicKey;
NSMutableDictionary* wrapperDic = objc_getAssociatedObject(self, &wrappersDicKey);
if (!wrapperDic) {
wrapperDic = [NSMutableDictionary dictionary];
objc_setAssociatedObject(self, &wrappersDicKey, wrapperDic, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
NSMutableArray* wrapperArr = wrapperDic[@(event)];
if (!wrapperArr) {
wrapperArr = [NSMutableArray array];
wrapperDic[@(event)] = wrapperArr;
}
return wrapperArr;
}
@end
获取应用当前正显示的ViewController
*给UIApplication添加类别
.h中
#import
@interface UIApplication (Ext)
/**
* 获取应用当前正显示的ViewController
*
* @return ViewController
*/
- (UIViewController *)currentViewController;
@end
.m中
#import "UIApplication+Ext.h"
@implementation UIApplication (Ext)
+ (UIViewController*)_findBestViewController:(UIViewController*)vc {
if (vc.presentedViewController) {
// Return presented view controller
return [self _findBestViewController:vc.presentedViewController];
} else if ([vc isKindOfClass:[UISplitViewController class]]) {
// Return right hand side
UISplitViewController* svc = (UISplitViewController*) vc;
if (svc.viewControllers.count > 0)
return [self _findBestViewController:svc.viewControllers.lastObject];
else
return vc;
} else if ([vc isKindOfClass:[UINavigationController class]]) {
// Return top view
UINavigationController* svc = (UINavigationController*) vc;
if (svc.viewControllers.count > 0)
return [self _findBestViewController:svc.topViewController];
else
return vc;
} else if ([vc isKindOfClass:[UITabBarController class]]) {
// Return visible view
UITabBarController* svc = (UITabBarController*) vc;
if (svc.viewControllers.count > 0)
return [self _findBestViewController:svc.selectedViewController];
else
return vc;
} else {
// Unknown view controller type, return last child view controller
return vc;
}
}
- (UIViewController *)currentViewController {
UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
return [UIApplication _findBestViewController:viewController];
}
@end
返回NavigationBar上的FixedSpace，用于缩短按钮间距
#import
@interface UIBarButtonItem (FixedSpace)
/**
* 返回NavigationBar上的FixedSpace，用于缩短按钮间距
*
* @return
*/
+ (instancetype)createNavigationFixedItem;
@end
.m
#import "UIBarButtonItem+FixedSpace.h"
@implementation UIBarButtonItem (FixedSpace)
+ (instancetype)createNavigationFixedItem {
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
item.width = -10;
return item;
}
@end
对图片的处理
.h
#import
@interface UIImage (AdjustmentSize)
/**
* 调整图片尺寸到新尺寸，不保持比例
*
* @param newSize 新尺寸
*
* @return 调整后的图片
*/
- (UIImage *)adjustmentWithNewSize:(CGSize)newSize;
/**
* 调整图片尺寸到指定大小范围内，保存比例（大了会缩小，小的不变）
*
* @param maxSize 宽或高最大尺寸
*
* @return 调整后的图片
*/
- (UIImage *)adjustedToMaxSize:(NSInteger)maxSize;
/**
* 调整图片尺寸到当前工程标准大小
*
* @return 调整后的图片
*/
- (UIImage *)adjustedToStandardSize;
@end
.m
#import "UIImage+AdjustmentSize.h"
@implementation UIImage (AdjustmentSize)
- (UIImage *)adjustmentWithNewSize:(CGSize)newSize {
UIGraphicsBeginImageContext(newSize);
[self drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
- (UIImage *)adjustedToMaxSize:(NSInteger)maxSize {
if (self.size.width >= self.size.height && self.size.width > maxSize) {
CGSize newSize;
newSize.width = maxSize;
newSize.height = self.size.height * (maxSize / self.size.width);
return [self adjustmentWithNewSize:newSize];
}
else if (self.size.height > maxSize) {
CGSize newSize;
newSize.height = maxSize;
newSize.width = self.size.width * (maxSize / self.size.height);
return [self adjustmentWithNewSize:newSize];
}
else {
return self;
}
}
- (UIImage *)adjustedToStandardSize {
return [self adjustedToMaxSize:1920];
}
@end