给富文本NSMutableAttributedString扩展分类,添加自己封装的方法

NS_ASSUME_NONNULL_BEGIN

@interface NSMutableAttributedString (Ext)

- (instancetype)stringAppendString:(NSString *)string withAttr:(NSDictionary *)attr;
+ (instancetype)stringAppendString:(NSString *)string withAttr:(NSDictionary *)attr;

@end

NS_ASSUME_NONNULL_END


#import "NSMutableAttributedString+Ext.h"

@implementation NSMutableAttributedString (Ext)

+ (instancetype)stringAppendString:(NSString *)string withAttr:(NSDictionary *)attr {
    NSMutableAttributedString *aString = [[NSMutableAttributedString alloc] init];
    [aString stringAppendString:string withAttr:attr];
    return aString;
}

- (instancetype)stringAppendString:(NSString *)string withAttr:(NSDictionary *)attr {
    
    if (attr == nil) {
        attr = @{};
    }
    if (string && string.length) {
        NSMutableAttributedString *multableAttrString = [[NSMutableAttributedString alloc] initWithString:string];
        [multableAttrString setAttributes:attr range:NSMakeRange(0, string.length)];
        [self appendAttributedString:multableAttrString];
    }
    return self;
}
@end

使用示例:

- (void)viewDidLoad {
    [super viewDidLoad];

    NSMutableAttributedString *attr1 = [NSMutableAttributedString stringAppendString:@"船长" withAttr:@{NSForegroundColorAttributeName : [UIColor redColor]}];
    NSMutableAttributedString *attr2 = [attr1 stringAppendString:@"学习录" withAttr:@{NSForegroundColorAttributeName : [UIColor blueColor]}];
    NSMutableAttributedString *attr3 = [attr2 stringAppendString:@"之链式编程" withAttr:@{NSFontAttributeName : [UIFont systemFontOfSize:22],NSBackgroundColorAttributeName : [UIColor yellowColor]}];
    self.label.attributedText = attr3;
}

demo

Swift示例

extension NSMutableAttributedString {
    
    @discardableResult
    static func dx_AppendString(string: String, attr: Dictionary<NSAttributedString.Key, Any>? ) -> NSMutableAttributedString{
    
        let attrs = NSMutableAttributedString.init(string: string, attributes: attr)
        return attrs
    }
    
    @discardableResult
    func dx_AppendString(string: String, attr: Dictionary<NSAttributedString.Key, Any>) -> Self{
        
        if string.count > 0 {
            let aString = NSMutableAttributedString.init(string: string)
            aString.setAttributes(attr, range: NSRange.init(location: 0, length: string.count))
            self.append(aString)
        }
        return self
    }
}