第十篇、自定义UIBarButtonItem和UIButton block回调

// 自定义导航栏左边按钮
 self.navigationItem.leftBarButtonItem = [JQBlockedBarButtonItem blockedBarButtonItemWithTitle:@"返回" eventHandler:^{
        [weakSelf.navigationController popViewControllerAnimated:YES];
    }];

// 声明文件提供常用的接口
@interface JQBlockedBarButtonItem : UIBarButtonItem
+ (instancetype)blockedBarButtonItemWithTitle:(NSString *)title eventHandler:(void(^)())eventHandler;
+ (instancetype)blockedBarButtonItemWithImage:(UIImage *)image eventHandler:(void (^)())eventHandler;
+ (instancetype)blockedBarButtonItemWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem eventHandler:(void (^)())eventHandler;
+ (instancetype)blockedBarButtonItemWithCustomView:(UIView *)customView eventHandler:(void (^)())eventHandler;
@end

#import "JQBlockedBarButtonItem.h"

@interface JQBlockedBarButtonItem ()
@property (nonatomic, copy) void(^eventHandler)();
@property (nonatomic, strong) UITapGestureRecognizer *customViewTapGestureRecognizer;
@end

@implementation GKBlockedBarButtonItem

- (instancetype)initWithTitle:(NSString *)title {
    self = [super initWithTitle:title style:UIBarButtonItemStylePlain target:nil action:nil];

    [self setup];

    return self;
}

- (instancetype)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem {
    self = [super initWithBarButtonSystemItem:systemItem target:nil action:nil];

    [self setup];

    return self;
}

- (instancetype)initWithImage:(UIImage *)image {
    self = [super initWithImage:image style:UIBarButtonItemStylePlain target:nil action:nil];

    [self setup];

    return self;
}

- (void)setup {
    self.target = self;
    self.action = @selector(tapped);
}

- (instancetype)initWithCustomView:(UIView *)customView eventHandler:(void(^)())eventHandler {
    self = [super initWithCustomView:customView];

    if (eventHandler) {
        self.customViewTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(customViewTapGestureRecognizer:)];
        [customView addGestureRecognizer:self.customViewTapGestureRecognizer];
    }
    self.eventHandler = eventHandler;

    return self;
}

- (void)tapped {
    if (self.eventHandler) {
        self.eventHandler();
    }
}

- (void)customViewTapGestureRecognizer:(UITapGestureRecognizer *)gr {
    [self tapped];
}

+ (instancetype)blockedBarButtonItemWithTitle:(NSString *)title eventHandler:(void (^)())eventHandler {
    GKBlockedBarButtonItem *tmp = [[GKBlockedBarButtonItem alloc] initWithTitle:title];
    tmp.eventHandler = eventHandler;

    return tmp;
}

+ (instancetype)blockedBarButtonItemWithImage:(UIImage *)image eventHandler:(void (^)())eventHandler {
    GKBlockedBarButtonItem *tmp = [[GKBlockedBarButtonItem alloc] initWithImage:image];
    tmp.eventHandler = eventHandler;

    return tmp;
}

+ (instancetype)blockedBarButtonItemWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem eventHandler:(void (^)())eventHandler {
    GKBlockedBarButtonItem *tmp = [[GKBlockedBarButtonItem alloc] initWithBarButtonSystemItem:systemItem];
    tmp.eventHandler = eventHandler;

    return tmp;
}

+ (instancetype)blockedBarButtonItemWithCustomView:(UIView *)customView {
    return [[self class] blockedBarButtonItemWithCustomView:customView eventHandler:nil];
}

+ (instancetype)blockedBarButtonItemWithCustomView:(UIView *)customView eventHandler:(void (^)())eventHandler {
    GKBlockedBarButtonItem *item = [[GKBlockedBarButtonItem alloc] initWithCustomView:customView eventHandler:eventHandler];

    return item;
}

- (void)dealloc {
    if (self.customView && _customViewTapGestureRecognizer) {
        [self.customView removeGestureRecognizer:_customViewTapGestureRecognizer];
    }
}
@end

// 自定义按钮,特意选了个最长的~
   CGRect rect = CGRectMake(, , , );
    __weak typeof(self) weakSelf = self;
    JQBlockedButton *blockedBtn = [JQBlockedButton blockedButtonWithTapHandler:^{
        NSLog(@"点击了按钮");
        [weakSelf.navigationController pushViewController:[TestViewController new] animated:YES];
    } frame:rect addToSuperview:self.view];

    blockedBtn.backgroundColor = [UIColor redColor];

@interface JQBlockedButton : UIButton
/**
 *  点击事件回调
 */
@property (nonatomic, copy) void(^tapHandler)();
/**
 *  快速创建带block回调的按钮
 *
 *  @param tapHandler 回调事件
 *
 */
+ (instancetype)blockedButtonWithTapHandler:(void(^)())tapHandler;
/**
 *  快速创建带block回调的按钮
 *
 *  @param tapHandler 回调事件
 *  @param frame      位置信息
 */
+ (instancetype)blockedButtonWithTapHandler:(void(^)())tapHandler frame:(CGRect)frame;
/**
 *  快速创建带block回调的按钮,并添加到父控件
 *
 *  @param tapHandler 回调事件
 *  @param frame      位置信息
 *  @param superview  父控件
 */
+ (instancetype)blockedButtonWithTapHandler:(void(^)())tapHandler frame:(CGRect)frame addToSuperview:(UIView *)superview;
@end

@implementation JQBlockedButton

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];

    [self setup];

    return self;
}

- (void)awakeFromNib {
    [super awakeFromNib];

    [self setup];
}

- (void)setup {
    [self addTarget:self action:@selector(tapped) forControlEvents:UIControlEventTouchUpInside];

}

- (void)tapped {
    if (_tapHandler) {
        _tapHandler();
    }
}

+ (instancetype)blockedButtonWithTapHandler:(void(^)())tapHandler {
    return [self blockedButtonWithTapHandler:tapHandler frame:CGRectNull addToSuperview:nil];
}

+ (instancetype)blockedButtonWithTapHandler:(void(^)())tapHandler frame:(CGRect)frame {
    return [self blockedButtonWithTapHandler:tapHandler frame:frame addToSuperview:nil];
}

+ (instancetype)blockedButtonWithTapHandler:(void(^)())tapHandler frame:(CGRect)frame addToSuperview:(UIView *)superview {
    GKBlockedButton *button = [GKBlockedButton new];
    button.tapHandler = tapHandler;

    if (!CGRectIsNull(frame)) {
        button.frame = frame;
    }

    if (superview) {
        [superview addSubview:button];
    }

    return button;
}

@end